[devel] ci: refresh docs build dependencies: bump antsibull-docs to 2.18.0 (#2756)

* Bump antsibull-docs to 2.18.0.

* ci: refresh docs build dependencies

---------

Co-authored-by: Felix Fontein <[email protected]>
Co-authored-by: Ansible Documentation Bot <147556122+ansible-documentation-bot[bot]@users.noreply.github.com>

Author: ansible-documentation-bot[bot]

tests/constraints.in

@@ -3,7 +3,7 @@
 # This constraint file also pins other versions for which there are known limitations.
 
 sphinx == 7.2.5
-antsibull-docs == 2.17.0  # currently approved version
+antsibull-docs == 2.18.0  # currently approved version
 
 sphinx-rtd-theme >= 2.0.0  # Fix 404 pages with new sphinx -- https://github.com/ansible/ansible-documentation/issues/678
 rstcheck < 6  # rstcheck 6.x has problem with rstcheck.core triggered by include files w/ sphinx directives https://github.com/rstcheck/rstcheck-core/issues/3

tests/requirements.txt

@@ -26,11 +26,11 @@ antsibull-changelog==0.34.0
     # via antsibull-docs
 antsibull-core==3.4.0
     # via antsibull-docs
-antsibull-docs==2.17.0
+antsibull-docs==2.18.0
     # via
     #   -c tests/constraints.in
     #   -r tests/requirements.in
-antsibull-docs-parser==1.2.0
+antsibull-docs-parser==1.2.1
     # via antsibull-docs
 antsibull-docutils==1.2.0
     # via antsibull-changelog
@@ -90,7 +90,7 @@ jinja2==3.1.6
     #   sphinx
 markupsafe==3.0.2
     # via jinja2
-multidict==6.5.0
+multidict==6.4.4
     # via
     #   aiohttp
     #   yarl