chore: bump the actions group with 2 updates

Bumps the actions group with 2 updates: [actions/upload-artifact](https://github.com/actions/upload-artifact) and [actions/download-artifact](https://github.com/actions/download-artifact).


Updates `actions/upload-artifact` from 5 to 6
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v6)

Updates `actions/download-artifact` from 6 to 7
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v6...v7)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: actions/download-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/build-test.yml

@@ -87,7 +87,7 @@ jobs:
           ls -lh dist/
 
       - name: Upload artifact
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: pyos-sphinx-theme-artifact
           path: dist/

.github/workflows/publish-pypi.yml

@@ -43,7 +43,7 @@ jobs:
           ls -lh dist/
       # Store an artifact of the build to use in the publish step below
       - name: Store the distribution packages
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: python-package-distributions
           path: dist/
@@ -62,7 +62,7 @@ jobs:
     steps:
       # Version 4 doesn't support github enterprise yet
       - name: Download all the dists
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v7
         with:
           name: python-package-distributions
           path: dist/
@@ -84,7 +84,7 @@ jobs:
       id-token: write  # this permission is mandatory for sigstore
     steps:
     - name: Download all the dists
-      uses: actions/download-artifact@v6
+      uses: actions/download-artifact@v7
       with:
         name: python-package-distributions
         path: dist/