Update sphinxcontrib-httpdomain requirement from ~=1.8.1 to ~=2.0.0 (#5877)

Updates the requirements on [sphinxcontrib-httpdomain](https://github.com/sphinx-contrib/httpdomain) to permit the latest version.
- [Release notes](https://github.com/sphinx-contrib/httpdomain/releases)
- [Changelog](https://github.com/sphinx-contrib/httpdomain/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/sphinx-contrib/httpdomain/compare/1.8.1...2.0.0)

---
updated-dependencies:
- dependency-name: sphinxcontrib-httpdomain
  dependency-version: 2.0.0
  dependency-type: direct:production
...

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

doc/requirements.rtd.txt

@@ -1,6 +1,6 @@
 sphinx==9.1.*
 sphinx-rtd-theme~=3.1.0
-sphinxcontrib-httpdomain~=1.8.1
+sphinxcontrib-httpdomain~=2.0.0
 sphinxcontrib-images~=1.0.1
 sphinxcontrib-jquery~=4.1
 sphinxcontrib-spelling~=8.0.2

doc/requirements.txt

@@ -1,7 +1,7 @@
 -e ../
 sphinx==9.1.*
 sphinx-rtd-theme~=3.1.0
-sphinxcontrib-httpdomain~=1.8.1
+sphinxcontrib-httpdomain~=2.0.0
 sphinxcontrib-images~=1.0.1
 sphinxcontrib-jquery~=4.1
 sphinxcontrib-spelling~=8.0.2