CI: upgrade actions/setup-go to v5

Signed-off-by: Jiang Xin <[email protected]>

.github/workflows/git-pot.yml

@@ -101,10 +101,11 @@ jobs:
             git add po/git.pot &&
             git commit -m "Initialize po/git.pot"
           fi
-      - uses: actions/setup-go@v2
+      - uses: actions/setup-go@v5
         if: steps.skip-if-redundant.outputs.status != 'skip'
         with:
           go-version: '^1.18'
+          cache: false
       - name: Install git-po-helper
         if: steps.skip-if-redundant.outputs.status != 'skip'
         run: go install github.com/git-l10n/git-po-helper@main