Backport PR pandas-dev#44134: CI: Pin pre-commit python version (pandas-dev#44135)

Co-authored-by: Ali McMaster <[email protected]>

Author: meeseeksmachine

.github/workflows/pre-commit.yml

@@ -13,4 +13,6 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-python@v2
+      with:
+        python-version: '3.9.7'
     - uses: pre-commit/[email protected]