Update python version in link verifier

Author: kar-rahul-aws

.github/workflows/ci.yml

@@ -252,7 +252,7 @@ jobs:
       - name: Setup Python for link verifier action
         uses: actions/setup-python@v2
         with:
-          python-version: '3.7.10'
+          python-version: '3.8'
       - name: Check Links
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}