Update Python setup action version in workflow

Signed-off-by: John Mertic <jmertic@linuxfoundation.org>

Author: jmertic

.github/workflows/build-charters.yml

@@ -13,7 +13,7 @@ jobs:
       with:
         persist-credentials: true
     - name: Set up Python
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@2e3e4b15a884dc73a63f962bff250a855150a234
       with:
         python-version: '3.x'
         pip-install: -r requirements-build-charters.txt