[6.16.z] Bump sphinx-autoapi from 3.3.3 to 3.4.0 (#17036)

Bump sphinx-autoapi from 3.3.3 to 3.4.0 (#17033)

(cherry picked from commit 5dca526)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements-optional.txt

@@ -6,7 +6,7 @@ ruff==0.7.2
 
 # For generating documentation.
 sphinx==8.1.3
-sphinx-autoapi==3.3.3
+sphinx-autoapi==3.4.0
 
 # For 'manage' interactive shell
 manage==0.1.15