chore(deps): bump actions/upload-artifact from 6 to 7 (#574)

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

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

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

Author: dependabot[bot]

.github/workflows/build-docs.yml

@@ -36,7 +36,7 @@ jobs:
         run: bundle exec rake doc
 
       - name: Upload generated doc
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: doc
           path: doc

.github/workflows/build-gems.yml

@@ -50,7 +50,7 @@ jobs:
           platform: ${{ matrix.ruby-platform }}
           ruby-versions: ${{ join(fromJSON(needs.ci-data.outputs.result).stable-ruby-versions, ',') }}
 
-      - uses: actions/upload-artifact@v6
+      - uses: actions/upload-artifact@v7
         with:
           name: cross-gem-${{ matrix.ruby-platform }}
           path: ${{ steps.cross-gem.outputs.gem-path }}

.github/workflows/release.yml

@@ -50,7 +50,7 @@ jobs:
           platform: ${{ matrix.ruby-platform }}
           ruby-versions: ${{ join(fromJSON(needs.ci-data.outputs.result).stable-ruby-versions, ',') }}
 
-      - uses: actions/upload-artifact@v6
+      - uses: actions/upload-artifact@v7
         with:
           name: cross-gem-${{ matrix.ruby-platform }}
           path: pkg/*-${{ matrix.ruby-platform }}.gem