build(deps): update axllent/mailpit to v1.20.1

This MR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [axllent/mailpit](https://github.com/axllent/mailpit) | minor | `v1.19.3` -> `v1.20.1` |

MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot).

**Proposed changes to behavior should be submitted there as MRs.**

---

### Release Notes

<details>
<summary>axllent/mailpit (axllent/mailpit)</summary>

### [`v1.20.1`](https://github.com/axllent/mailpit/blob/HEAD/CHANGELOG.md#v1201)

[Compare Source](axllent/mailpit@v1.20.0...v1.20.1)

##### Chore

-   Shift inbox pagination to inbox component
-   Live load up to 100 new messages in sidebar ([#&#8203;336](axllent/mailpit#336))
-   Show icon attachment in new side navigation message listing ([#&#8203;345](axllent/mailpit#345))

##### Fix

-   Correctly decode X-Tags message headers (RFC 2047) ([#&#8203;344](axllent/mailpit#344))

### [`v1.20.0`](https://github.com/axllent/mailpit/blob/HEAD/CHANGELOG.md#v1200)

[Compare Source](axllent/mailpit@v1.19.3...v1.20.0)

##### Feature

-   Add option to control message retention by age ([#&#8203;338](axllent/mailpit#338))
-   **UI:** List messages in side nav when viewing message for easy navigation ([#&#8203;336](axllent/mailpit#336))

##### Chore

-   Update caniemail database
-   Update Go dependencies
-   Update node dependencies
-   Make internal tagging methods private

##### Fix

-   Prevent potential JavaScript errors caused by race condition
-   Better regexp to detect tags in search
-   Prevent Vue race condition to initialize dayjs relativeTime plugin
-   **API:** Return `text/plain` header for message delete request

</details>

---

### Configuration

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♻ **Rebasing**: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

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---

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---

This MR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
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chezmoi/dot_config/aquaproj-aqua/aqua.yaml

@@ -280,7 +280,7 @@ packages:
 - name: yassinebridi/[email protected]
   description: A simple terminal UI for search and replace, ala VS Code
   link: https://github.com/yassinebridi/serpl
-- name: axllent/mailpit@v1.19.3
+- name: axllent/mailpit@v1.20.1
   description: An email and SMTP testing tool with API for developers
   link: https://github.com/axllent/mailpit
 - name: mrjackwills/[email protected]