Set CodeQL language

Author: akoeplinger

eng/azure-pipelines-codeql.yml

@@ -14,6 +14,8 @@ variables:
   - template: /eng/common/templates/variables/pool-providers.yml
   - name: Codeql.Enabled
     value: True
+  - name: Codeql.Language
+    value: cpp
   - name: Codeql.Cadence
     value: 0
   - name: Codeql.TSAEnabled