Use ubuntu 20.04 in pre-commit workflow

Author: oleksandr-pavlyk

.github/workflows/pre-commit.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   pre-commit:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
     - uses: actions/checkout@v3
     - uses: actions/setup-python@v4