Apply review suggestion

.github/workflows/test.yml

@@ -2,9 +2,9 @@ name: test
 
 on:
   push: # Run on pushes to the default branch
-    branches: [main]
+    branches: [python3.12-tests]
   pull_request_target: # Also run on pull requests originated from forks
-    branches: [main]
+    branches: [python3.12-tests]
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
@@ -43,6 +43,10 @@ jobs:
         exclude:
           - python-version: "3.11"
             airflow-version: "2.4"
+          # Apache Airflow versions prior to 2.9.0 have not been tested with Python 3.12.
+          # Official support for Python 3.12 and the corresponding constraints.txt are available only for Apache Airflow >= 2.9.0.
+          # See: https://github.com/apache/airflow/tree/2.9.0?tab=readme-ov-file#requirements
+          # See: https://github.com/apache/airflow/tree/2.8.4?tab=readme-ov-file#requirements
           - python-version: "3.12"
             airflow-version: "2.4"
           - python-version: "3.12"