chore: update actions/cache version in mysql8-migration workflow

Author: magajh

.github/workflows/mysql8-migrations-check.yml

@@ -36,7 +36,7 @@ jobs:
         echo "dir=$(pip cache dir)" >> $GITHUB_OUTPUT
     - name: Cache pip dependencies
       id: cache-dependencies
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ${{ steps.pip-cache-dir.outputs.dir }}
         key: ${{ runner.os }}-pip-${{ hashFiles('requirements/pip_tools.txt') }}