Bump sphinx from 5.1.1 to 8.1.3 (#2802)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 5.1.1 to 8.1.3.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/v8.1.3/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v5.1.1...v8.1.3)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

docs/requirements.txt

@@ -20,9 +20,9 @@ click==8.1.8
     # via uvicorn
 colorama==0.4.6
     # via sphinx-autobuild
-docutils==0.19
+docutils==0.21.2
     # via
-    #   -r requirements.in
+    #   -r docs/requirements.in
     #   sphinx
 exceptiongroup==1.2.1
     # via anyio
@@ -36,11 +36,11 @@ imagesize==1.4.1
     # via sphinx
 jinja2==3.1.5
     # via
-    #   -r requirements.in
+    #   -r docs/requirements.in
     #   sphinx
 markupsafe==2.0.1
     # via
-    #   -r requirements.in
+    #   -r docs/requirements.in
     #   jinja2
 packaging==24.1
     # via sphinx
@@ -52,29 +52,31 @@ sniffio==1.3.1
     # via anyio
 snowballstemmer==2.2.0
     # via sphinx
-sphinx==5.1.1
+sphinx==8.1.3
     # via
-    #   -r requirements.in
+    #   -r docs/requirements.in
     #   sphinx-autobuild
     #   sphinxcontrib-plantuml
 sphinx-autobuild==2024.10.3
-    # via -r requirements.in
+    # via -r docs/requirements.in
 sphinxcontrib-applehelp==1.0.8
     # via sphinx
 sphinxcontrib-devhelp==1.0.6
     # via sphinx
-sphinxcontrib-htmlhelp==2.0.5
+sphinxcontrib-htmlhelp==2.1.0
     # via sphinx
 sphinxcontrib-jsmath==1.0.1
     # via sphinx
 sphinxcontrib-plantuml==0.30
-    # via -r requirements.in
+    # via -r docs/requirements.in
 sphinxcontrib-qthelp==1.0.7
     # via sphinx
 sphinxcontrib-serializinghtml==1.1.10
     # via sphinx
 starlette==0.40.0
     # via sphinx-autobuild
+tomli==2.2.1
+    # via sphinx
 typing-extensions==4.12.2
     # via
     #   anyio