Get package version with `importlib.metadata`

[puddly]

pkg_resources is deprecated. This may also be related to https://github.com/zigpy/zigpy-znp/issues/205.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.03 :warning:

Comparison is base (9b959dc) 98.55% compared to head (4fdeb39) 98.52%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #207 +/- ## ========================================== - Coverage 98.55% 98.52% -0.03% ========================================== Files 43 43 Lines 3803 3801 -2 ========================================== - Hits 3748 3745 -3 - Misses 55 56 +1 ``` | [Impacted Files](https://codecov.io/gh/zigpy/zigpy-znp/pull/207?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zigpy) | Coverage Δ | | |---|---|---| | [zigpy\_znp/api.py](https://codecov.io/gh/zigpy/zigpy-znp/pull/207?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zigpy#diff-emlncHlfem5wL2FwaS5weQ==) | `96.71% <100.00%> (-0.25%)` | :arrow_down: | | [zigpy\_znp/tools/network\_backup.py](https://codecov.io/gh/zigpy/zigpy-znp/pull/207?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zigpy#diff-emlncHlfem5wL3Rvb2xzL25ldHdvcmtfYmFja3VwLnB5) | `97.82% <100.00%> (-0.05%)` | :arrow_down: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zigpy). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zigpy)

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