Pin distribution for pre-commit CI job

The GH action `pre-commit/action` installs `pre-commit` into the system
with `pip`.[^1] On newer distributions this is discouraged as it might break
system packages and would require a dedicated flag
`--break-system-packages` in order to pass.

Since the action does not work in such environments yet, instead pin the
distribution we use for the workflow to a fixed, older and working version.

[^1]: 576ff52938/action.yml (L11)

.github/workflows/pre-commit.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   pre-commit:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
     - uses: actions/checkout@v3
     - uses: actions/setup-python@v4