Set explicit python version for CI (#19306)

Set explicit python version for CI.

Author: karthiknadig

.github/workflows/assign-reviewers.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Install Python
         uses: actions/setup-python@v3
         with:
-          python-version: '3.10'
+          python-version: '3.x'
           cache: 'pip'
           cache-dependency-path: '.github/assign-reviewers/requirements.txt'
 

.github/workflows/build.yml

@@ -10,6 +10,7 @@ on:
 
 env:
   NODE_VERSION: 14.18.2
+  PYTHON_VERSION: 3.10
   # Force a path with spaces and to test extension works in these scenarios
   # Unicode characters are causing 2.7 failures so skip that for now.
   special-working-directory: './path with spaces'