workflows codeql: python installation

.github/workflows/codeql-analysis.yml

@@ -36,11 +36,18 @@ jobs:
         # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
         # Learn more:
         # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
+        language_version: [ '3.9' ]
 
     steps:
     - name: Checkout repository
       uses: actions/checkout@v2
 
+    # Set up Python
+    - name: Set up Python ${{ matrix.language_version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.language_version }}
+
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v1