Fix usage of `importlib_resources` for Python >= 3.7

[penguinpee]

importlib.resources is part of the Python standard library since Python 3.7:

https://docs.python.org/3/library/importlib.resources.html

Make sure limits is compatible with Python >= 3.7.

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (ada96bb) 96.58% compared to head (ba93be6) 96.59%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #184 +/- ## ======================================= Coverage 96.58% 96.59% ======================================= Files 25 25 Lines 1173 1176 +3 Branches 127 127 ======================================= + Hits 1133 1136 +3 Misses 20 20 Partials 20 20 ``` | [Files](https://app.codecov.io/gh/alisaifee/limits/pull/184?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Ali-Akber+Saifee) | Coverage Δ | | |---|---|---| | [limits/util.py](https://app.codecov.io/gh/alisaifee/limits/pull/184?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Ali-Akber+Saifee#diff-bGltaXRzL3V0aWwucHk=) | `98.78% <100.00%> (+0.04%)` | :arrow_up: |

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[alisaifee]

Python 3.7 support was actually dropped recently so the conditional import & dependency could just be removed altogether

[penguinpee]

Python 3.7 support was actually dropped recently so the conditional import & dependency could just be removed altogether

That's up to you, really. In Fedora all currently supported releases are Python >= 3.11.

Removing it, though, will break older Python releases. Whereas the patch, as is, is backward compatible.

[alisaifee]

Closing in favor of d9a8fba0616f6736c845a156e669b7d1e13cbd86

[alisaifee]

Actually it looks like importlib.resources.files is only available in python 3.9 and conditionally handling that in code is more effort than I think it's worth. Once python 3.8 is EOL I can remove this.