chore(deps): update dependency pytest-mypy-plugins to v3 (#777)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[pytest-mypy-plugins](https://github.com/TypedDjango/pytest-mypy-plugins)
| `==1.11.1` -> `==3.0.0` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/pytest-mypy-plugins/3.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/pytest-mypy-plugins/3.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/pytest-mypy-plugins/1.11.1/3.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/pytest-mypy-plugins/1.11.1/3.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>TypedDjango/pytest-mypy-plugins (pytest-mypy-plugins)</summary>

###
[`v3.0.0`](https://github.com/TypedDjango/pytest-mypy-plugins/blob/HEAD/CHANGELOG.md#300)

[Compare
Source](https://github.com/TypedDjango/pytest-mypy-plugins/compare/2.0.0...3.0.0)

##### Features

-   *Breaking*: Drop python3.7 support
- Add `pyproject.toml` config file support with
`--mypy-pyproject-toml-file` option

##### Bugfixes

-   Add `tox.ini` file to `sdist` package
-   Add `requirements.txt` file to `sdist` package
-   Add `pyproject.toml` file to `sdist` package

###
[`v2.0.0`](https://github.com/TypedDjango/pytest-mypy-plugins/blob/HEAD/CHANGELOG.md#200)

[Compare
Source](https://github.com/TypedDjango/pytest-mypy-plugins/compare/1.11.1...2.0.0)

##### Features

-   Use `jinja2` instead of `chevron` for templating
-   Allow parametrizing `mypy_config` field in tests
-   Bump minimal `mypy` and `pytest` versions

##### Bugfixes

-   Also include `mypy.ini` and `pytest.ini` to `sdist` package

</details>

---

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pipelines/requirements/typesafety-mypy.txt

@@ -1,2 +1,2 @@
 -r test.txt
-pytest-mypy-plugins==1.11.1
+pytest-mypy-plugins==3.0.0