Limit astroid version to < 2.12 (#24982)

Astroid 2.12 released 9th of July breaks documentation building
with sphinx-autoapi.

Issue about it has been opened in
pylint-dev/astroid#1708

Until it is fixed, we should limit astroid.

GitOrigin-RevId: ee564ef9e57707ef07db1c3353a1406e47d8e3db

setup.py

@@ -247,6 +247,9 @@ def write_version(filename: str = str(AIRFLOW_SOURCES_ROOT / "airflow" / "git_ve
     'requests>=2.26.0',
 ]
 doc = [
+    # Astroid 2.12.* breaks documentation building
+    # We can remove the limit here after https://github.com/PyCQA/astroid/issues/1708 is solved
+    'astroid<2.12.0',
     'click>=8.0',
     # Docutils 0.17.0 converts generated <div class="section"> into <section> and breaks our doc formatting
     # By adding a lot of whitespace separation. This limit can be lifted when we update our doc to handle