Bump sphinx from 7.4.6 to 8.0.2 in /requirements (mozilla#22525)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.4.6 to 8.0.2.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v7.4.6...v8.0.2)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:development
  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>

Author: dependabot[bot]

Diff for: requirements/dev.txt

@@ -44,9 +44,9 @@ supervisor==4.2.5 \
     --hash=sha256:2ecaede32fc25af814696374b79e42644ecaba5c09494c51016ffda9602d0f08 \
     --hash=sha256:34761bae1a23c58192281a5115fb07fbf22c9b0133c08166beffc70fed3ebc12
 # Sphinx is required by sphinxcontrib-httpdomain
-Sphinx==7.4.6 \
-    --hash=sha256:116918d455c493fff3178edea12b4fe1c1e4894680fd81e7b7431ea21d47ca52 \
-    --hash=sha256:915760d6188288a1e30c2cd0d9fa31b1b009bc6e6019cc0c32d16c77d20e86d9
+Sphinx==8.0.2 \
+    --hash=sha256:0cce1ddcc4fd3532cf1dd283bc7d886758362c5c1de6598696579ce96d8ffa5b \
+    --hash=sha256:56173572ae6c1b9a38911786e206a110c9749116745873feae4f9ce88e59391d
 # alabaster is required by Sphinx
 alabaster==0.7.16 \
     --hash=sha256:75a8b99c28a5dad50dd7f8ccdd447a121ddb3892da9e53d1ca5cca3106d58d65 \