Update dependency pdm-backend to v2.3.0 (#173)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [pdm-backend](https://togithub.com/pdm-project/pdm-backend) |
build-system.requires | minor | `==2.1.8` -> `==2.3.0` |

---

### Release Notes

<details>
<summary>pdm-project/pdm-backend (pdm-backend)</summary>

###
[`v2.3.0`](https://togithub.com/pdm-project/pdm-backend/releases/tag/2.3.0)

[Compare
Source](https://togithub.com/pdm-project/pdm-backend/compare/2.2.1...2.3.0)

#####    🚀 Features

- Remove support for python 3.7 and older  -  by
[@&#8203;frostming](https://togithub.com/frostming) in
[https://github.com/pdm-project/pdm-backend/issues/232](https://togithub.com/pdm-project/pdm-backend/issues/232)
[<samp>(32e3a)</samp>](https://togithub.com/pdm-project/pdm-backend/commit/32e3a33)
- Add `tag_filter` as a way to pre-filter tags  -  by
[@&#8203;mezuzza](https://togithub.com/mezuzza) in
[https://github.com/pdm-project/pdm-backend/issues/225](https://togithub.com/pdm-project/pdm-backend/issues/225)
[<samp>(9915c)</samp>](https://togithub.com/pdm-project/pdm-backend/commit/9915cb6)

#####    🐞 Bug Fixes

- Error about dynamic project version  -  by
[@&#8203;cntvc](https://togithub.com/cntvc) in
[https://github.com/pdm-project/pdm-backend/issues/235](https://togithub.com/pdm-project/pdm-backend/issues/235)
[<samp>(146b1)</samp>](https://togithub.com/pdm-project/pdm-backend/commit/146b170)
- **ci**: CI matrix on macos latest  -  by
[@&#8203;frostming](https://togithub.com/frostming)
[<samp>(080b4)</samp>](https://togithub.com/pdm-project/pdm-backend/commit/080b4bc)

#####    💻 Chores

- Use `Literal` type for valid target values  -  by
[@&#8203;DetachHead](https://togithub.com/DetachHead),
**pre-commit-ci\[bot]** and **Frost Ming** in
[https://github.com/pdm-project/pdm-backend/issues/227](https://togithub.com/pdm-project/pdm-backend/issues/227)
[<samp>(a210b)</samp>](https://togithub.com/pdm-project/pdm-backend/commit/a210b72)

#####     [View changes on
GitHub](https://togithub.com/pdm-project/pdm-backend/compare/2.2.1...2.3.0)

###
[`v2.2.1`](https://togithub.com/pdm-project/pdm-backend/releases/tag/2.2.1)

[Compare
Source](https://togithub.com/pdm-project/pdm-backend/compare/2.2.0...2.2.1)

#####    🚀 Features

- Add parameter `--build-number` to wheel builder  -  by
[@&#8203;0xfabioo](https://togithub.com/0xfabioo) and **Frost Ming** in
[https://github.com/pdm-project/pdm-backend/issues/229](https://togithub.com/pdm-project/pdm-backend/issues/229)
[<samp>(d7d15)</samp>](https://togithub.com/pdm-project/pdm-backend/commit/d7d15fb)
- Bump pyproject-metadata to 0.8.0  -  by
[@&#8203;frostming](https://togithub.com/frostming) in
[https://github.com/pdm-project/pdm-backend/issues/231](https://togithub.com/pdm-project/pdm-backend/issues/231)
[<samp>(5f538)</samp>](https://togithub.com/pdm-project/pdm-backend/commit/5f53873)

#####     [View changes on
GitHub](https://togithub.com/pdm-project/pdm-backend/compare/2.2.0...2.2.1)

###
[`v2.2.0`](https://togithub.com/pdm-project/pdm-backend/releases/tag/2.2.0)

[Compare
Source](https://togithub.com/pdm-project/pdm-backend/compare/2.1.8...2.2.0)

#####    🚀 Features

- Don't add '+editable' to the editable version  -  by
[@&#8203;frostming](https://togithub.com/frostming)
[<samp>(e6fcd)</samp>](https://togithub.com/pdm-project/pdm-backend/commit/e6fcd5f)
- Custom version format for source="scm"  -  by
[@&#8203;frostming](https://togithub.com/frostming) in
[https://github.com/pdm-project/pdm-backend/issues/217](https://togithub.com/pdm-project/pdm-backend/issues/217)
[<samp>(4f20c)</samp>](https://togithub.com/pdm-project/pdm-backend/commit/4f20cfd)
- Fallback_version config for scm version  -  by
[@&#8203;frostming](https://togithub.com/frostming)
[<samp>(8b8ab)</samp>](https://togithub.com/pdm-project/pdm-backend/commit/8b8ab28)
- **vendor**: Update packaging to 24.0  -  by
[@&#8203;frostming](https://togithub.com/frostming)
[<samp>(81836)</samp>](https://togithub.com/pdm-project/pdm-backend/commit/8183604)
- **vendors**: Update pyproject-metadata to 0.8.0rc1  -  by
[@&#8203;frostming](https://togithub.com/frostming) in
[https://github.com/pdm-project/pdm-backend/issues/228](https://togithub.com/pdm-project/pdm-backend/issues/228)
[<samp>(6b260)</samp>](https://togithub.com/pdm-project/pdm-backend/commit/6b2601e)

#####    🐞 Bug Fixes

- Change to datetime.now(tz=UTC)  -  by
[@&#8203;frostming](https://togithub.com/frostming)
[<samp>(74f7a)</samp>](https://togithub.com/pdm-project/pdm-backend/commit/74f7a61)

#####    📝 Documentation

- Add missing dep  -  by
[@&#8203;frostming](https://togithub.com/frostming)
[<samp>(feb9f)</samp>](https://togithub.com/pdm-project/pdm-backend/commit/feb9fc7)

#####    💻 Chores

- Update lockfile to the latest version  -  by
[@&#8203;frostming](https://togithub.com/frostming)
[<samp>(940d1)</samp>](https://togithub.com/pdm-project/pdm-backend/commit/940d129)

#####     [View changes on
GitHub](https://togithub.com/pdm-project/pdm-backend/compare/2.1.8...2.2.0)

</details>

---

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---

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Co-authored-by: Nicolas Drebenstedt <[email protected]>

pyproject.toml

@@ -144,5 +144,5 @@ known-first-party = ["mex", "tests"]
 convention = "google"
 
 [build-system]
-requires = ["pdm-backend==2.1.8"]
+requires = ["pdm-backend==2.3.0"]
 build-backend = "pdm.backend"