ci: run CodeQL on every PR

Since LGTM is no longer enabled for the systemd repo (as it's going to
be discontinued by the EOY), let's run CodeQL on every PR instead to
replace it.

.github/workflows/codeql-analysis.yml

@@ -6,18 +6,9 @@ name: "CodeQL"
 
 on:
   pull_request:
-    branches: [main]
-    paths:
-      - .github/codeql-config.yml
-      - .github/codeql-custom.qls
-      - .github/workflows/codeql-analysis.yml
-      - .github/workflows/requirements.txt
-      - .github/workflows/unit_tests.sh
-  # It takes the workflow approximately 30 minutes to analyze the code base
-  # so it doesn't seem to make much sense to trigger it on every PR or commit.
-  # It runs daily at 01:00 to avoid colliding with the Coverity workflow.
-  schedule:
-    - cron: '0 1 * * *'
+    branches:
+      - main
+      - v[0-9]+-stable
 
 permissions:
   contents: read
@@ -36,7 +27,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        language: [ 'cpp', 'python' ]
+        language: ['cpp', 'python']
 
     steps:
     - name: Checkout repository