[MRG] Fix Windows timer resolution not resetting after Association release

[scaramallion]

Reference issue

Fixes the windows timer resolution not resetting itself correctly, closes #954

Tasks

• [x] Fix or feature added
• [x] Unit tests passing and coverage at 100% after adding fix/feature

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (20993be) to head (1f14e87). Report is 13 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #955 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 28 28 Lines 8703 8708 +5 ========================================= + Hits 8703 8708 +5 ``` | [Files](https://app.codecov.io/gh/pydicom/pynetdicom/pull/955?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pydicom) | Coverage Δ | | |---|---|---| | [pynetdicom/utils.py](https://app.codecov.io/gh/pydicom/pynetdicom/pull/955?src=pr&el=tree&filepath=pynetdicom%2Futils.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pydicom#diff-cHluZXRkaWNvbS91dGlscy5weQ==) | `100.00% <100.00%> (ø)` | |