Update dependabot.yml to also include the feature branch

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 8.1.3 to 8.2.3.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](https://github.com/sphinx-doc/sphinx/compare/v8.1.3...v8.2.3)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

.github/dependabot.yml

@@ -5,7 +5,16 @@
 
 version: 2
 updates:
+  # Update dependencies on the main branch
   - package-ecosystem: "pip" # See documentation for possible values
     directory: "/" # Location of package manifests
     schedule:
       interval: "weekly"
+    target-branch: "main" # Target the main branch
+
+  # Update dependencies on the feature/config-nested branch
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    target-branch: "feature/config-nested" # Target the specific feature branch

requirements-dev.txt

@@ -2,7 +2,7 @@
 gitpython==3.1.44
 linkify-it-py==2.0.3
 myst-parser==4.0.1
-sphinx==8.1.3
+sphinx==8.2.3
 sphinx_rtd_theme==3.0.2
 sphinx-tabs==3.4.7
 pytest==8.3.5