Update codeql-analysis.yml

Remove proposed/3.0.0 branch, only ever run against Python sans matrix option

.github/workflows/codeql-analysis.yml

@@ -7,7 +7,7 @@ name: "CodeQL"
 
 on:
   push:
-    branches: [master, proposed/3.0.0]
+    branches: [master]
   pull_request:
     # The branches below must be a subset of the branches above
     branches: [master]
@@ -21,12 +21,7 @@ jobs:
 
     strategy:
       fail-fast: false
-      matrix:
-        # Override automatic language detection by changing the below list
-        # Supported options are ['csharp', 'cpp', 'go', 'java', 'javascript', 'python']
-        language: ['python']
-        # Learn more...
-        # https://docs.github.com/en/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#overriding-automatic-language-detection
+
 
     steps:
     - name: Checkout repository
@@ -45,7 +40,7 @@ jobs:
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v1
       with:
-        languages: ${{ matrix.language }}
+        languages: "python"
         # If you wish to specify custom queries, you can do so here or in a config file.
         # By default, queries listed here will override any specified in a config file. 
         # Prefix the list here with "+" to use these queries and those in the config file.