deps: update dependency typing-extensions to v4.3.0 (#5245)

[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [typing-extensions](https://togithub.com/python/typing_extensions) ([changelog](https://togithub.com/python/typing_extensions/blob/main/CHANGELOG.md)) | `==4.1.1` -> `==4.3.0` | [![age](https://badges.renovateapi.com/packages/pypi/typing-extensions/4.3.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/typing-extensions/4.3.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/typing-extensions/4.3.0/compatibility-slim/4.1.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/typing-extensions/4.3.0/confidence-slim/4.1.1)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>python/typing_extensions</summary>

### [`v4.3.0`](https://togithub.com/python/typing_extensions/blob/HEAD/CHANGELOG.md#Release-430-July-1-2022)

[Compare Source](https://togithub.com/python/typing_extensions/compare/4.2.0...4.3.0)

-   Add `typing_extensions.NamedTuple`, allowing for generic `NamedTuple`s on
    Python <3.11 (backport from [python/cpython#&#8203;92027](https://togithub.com/python/cpython/issues/92027), by Serhiy Storchaka). Patch
    by Alex Waygood ([@&#8203;AlexWaygood](https://togithub.com/AlexWaygood)).
-   Adjust `typing_extensions.TypedDict` to allow for generic `TypedDict`s on
    Python <3.11 (backport from [python/cpython#&#8203;27663](https://togithub.com/python/cpython/issues/27663), by Samodya Abey). Patch by
    Alex Waygood ([@&#8203;AlexWaygood](https://togithub.com/AlexWaygood)).

### [`v4.2.0`](https://togithub.com/python/typing_extensions/blob/HEAD/CHANGELOG.md#Release-420-April-17-2022)

[Compare Source](https://togithub.com/python/typing_extensions/compare/4.1.1...4.2.0)

-   Re-export `typing.Unpack` and `typing.TypeVarTuple` on Python 3.11.
-   Add `ParamSpecArgs` and `ParamSpecKwargs` to `__all__`.
-   Improve "accepts only single type" error messages.
-   Improve the distributed package. Patch by Marc Mueller ([@&#8203;cdce8p](https://togithub.com/cdce8p)).
-   Update `typing_extensions.dataclass_transform` to rename the
    `field_descriptors` parameter to `field_specifiers` and accept
    arbitrary keyword arguments.
-   Add `typing_extensions.get_overloads` and
    `typing_extensions.clear_overloads`, and add registry support to
    `typing_extensions.overload`. Backport from [python/cpython#&#8203;89263](https://togithub.com/python/cpython/issues/89263).
-   Add `typing_extensions.assert_type`. Backport from bpo-46480.
-   Drop support for Python 3.6. Original patch by Adam Turner ([@&#8203;AA-Turner](https://togithub.com/AA-Turner)).

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

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

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, click this checkbox.

---

This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://app.renovatebot.com/dashboard#github/googleapis/java-cloud-bom).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzMi4yMDQuNSIsInVwZGF0ZWRJblZlciI6IjMyLjIwNC41In0=-->

.kokoro/requirements.txt

@@ -447,9 +447,9 @@ six==1.16.0 \
     #   gcp-docuploader
     #   google-auth
     #   python-dateutil
-typing-extensions==4.1.1 \
-    --hash=sha256:1a9462dcc3347a79b1f1c0271fbe79e844580bb598bafa1ed208b94da3cdcd42 \
-    --hash=sha256:21c85e0fe4b9a155d0799430b0ad741cdce7e359660ccbd8b530613e8df88ce2
+typing-extensions==4.3.0 \
+    --hash=sha256:25642c956049920a5aa49edcdd6ab1e06d7e5d467fc00e0506c44ac86fbfca02 \
+    --hash=sha256:e6d2677a32f47fc7eb2795db1dd15c1f34eff616bcaf2cfb5e997f854fa1c4a6
     # via -r requirements.in
 urllib3==1.26.12 \
     --hash=sha256:3fa96cf423e6987997fc326ae8df396db2a8b7c667747d47ddd8ecba91f4a74e \