deps: update dependency importlib-metadata to v4.12.0 (#301)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [importlib-metadata](https://togithub.com/python/importlib_metadata) | `==4.8.3` -> `==4.12.0` | [![age](https://badges.renovateapi.com/packages/pypi/importlib-metadata/4.12.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/importlib-metadata/4.12.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/importlib-metadata/4.12.0/compatibility-slim/4.8.3)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/importlib-metadata/4.12.0/confidence-slim/4.8.3)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>python/importlib_metadata</summary>

### [`v4.12.0`](https://togithub.com/python/importlib_metadata/blob/HEAD/CHANGES.rst#v4120)

[Compare Source](https://togithub.com/python/importlib_metadata/compare/v4.11.4...v4.12.0)

\=======

-   py-93259: Now raise `ValueError` when `None` or an empty
    string are passed to `Distribution.from_name` (and other
    callers).

### [`v4.11.4`](https://togithub.com/python/importlib_metadata/blob/HEAD/CHANGES.rst#v4114)

[Compare Source](https://togithub.com/python/importlib_metadata/compare/v4.11.3...v4.11.4)

\=======

-   [#&#8203;379](https://togithub.com/python/importlib_metadata/issues/379): In `PathDistribution._name_from_stem`, avoid including
    parts of the extension in the result.
-   [#&#8203;381](https://togithub.com/python/importlib_metadata/issues/381): In `PathDistribution._normalized_name`, ensure names
    loaded from the stem of the filename are also normalized, ensuring
    duplicate entry points by packages varying only by non-normalized
    name are hidden.

### [`v4.11.3`](https://togithub.com/python/importlib_metadata/blob/HEAD/CHANGES.rst#v4113)

[Compare Source](https://togithub.com/python/importlib_metadata/compare/v4.11.2...v4.11.3)

\=======

-   [#&#8203;372](https://togithub.com/python/importlib_metadata/issues/372): Removed cast of path items in FastPath, not needed.

### [`v4.11.2`](https://togithub.com/python/importlib_metadata/blob/HEAD/CHANGES.rst#v4112)

[Compare Source](https://togithub.com/python/importlib_metadata/compare/v4.11.1...v4.11.2)

\=======

-   [#&#8203;369](https://togithub.com/python/importlib_metadata/issues/369): Fixed bug where `EntryPoint.extras` was returning
    match objects and not the extras strings.

### [`v4.11.1`](https://togithub.com/python/importlib_metadata/blob/HEAD/CHANGES.rst#v4111)

[Compare Source](https://togithub.com/python/importlib_metadata/compare/v4.11.0...v4.11.1)

\=======

-   [#&#8203;367](https://togithub.com/python/importlib_metadata/issues/367): In `Distribution.requires` for egg-info, if `requires.txt`
    is empty, return an empty list.

### [`v4.11.0`](https://togithub.com/python/importlib_metadata/blob/HEAD/CHANGES.rst#v4110)

[Compare Source](https://togithub.com/python/importlib_metadata/compare/v4.10.1...v4.11.0)

\=======

-   bpo-46246: Added `__slots__` to `EntryPoints`.

### [`v4.10.1`](https://togithub.com/python/importlib_metadata/blob/HEAD/CHANGES.rst#v4101)

[Compare Source](https://togithub.com/python/importlib_metadata/compare/v4.10.0...v4.10.1)

\=======

### [`v4.10.0`](https://togithub.com/python/importlib_metadata/blob/HEAD/CHANGES.rst#v4100)

[Compare Source](https://togithub.com/python/importlib_metadata/compare/v4.9.0...v4.10.0)

\=======

-   [#&#8203;354](https://togithub.com/python/importlib_metadata/issues/354): Removed `Distribution._local` factory. This
    functionality was created as a demonstration of the
    possible implementation. Now, the
    `pep517 <https://pypi.org/project/pep517>`\_ package
    provides this functionality directly through
    `pep517.meta.load <https://github.com/pypa/pep517/blob/a942316305395f8f757f210e2b16f738af73f8b8/pep517/meta.py#L63-L73>`\_.

### [`v4.9.0`](https://togithub.com/python/importlib_metadata/blob/HEAD/CHANGES.rst#v490)

[Compare Source](https://togithub.com/python/importlib_metadata/compare/v4.8.3...v4.9.0)

\======

-   Require Python 3.7 or later.

</details>

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