ci: refresh docs build dependencies

ansible-documentation-bot[bot] · felixfontein · commit 0c2fac37fd36 · 2025-08-10T14:32:14.000+02:00
diff --git a/tests/requirements.txt b/tests/requirements.txt
@@ -26,7 +26,7 @@ antsibull-changelog==0.34.0
     # via antsibull-docs
 antsibull-core==3.4.0
     # via antsibull-docs
-antsibull-docs==2.20.0
+antsibull-docs==2.21.0
     # via
     #   -c tests/constraints.in
     #   -r tests/requirements.in
