chore(deps): bump actions/upload-artifact from 6 to 7 (#186)

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
...

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

Author: dependabot[bot]

.github/workflows/publish-openapi-ui.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: eclipse-edc/.github/.github/actions/setup-build@main
       - name: Generate API Specs
         run: ./gradlew resolve
-      - uses: actions/upload-artifact@v6
+      - uses: actions/upload-artifact@v7
         with:
           name: openapi-spec
           path: resources/openapi/yaml
@@ -72,7 +72,7 @@ jobs:
           spec-file: ${{ matrix.apiGroup }}.yaml
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
-      - uses: actions/upload-artifact@v6
+      - uses: actions/upload-artifact@v7
         with:
           name: ${{ matrix.apiGroup }}
           path: swagger-ui

.github/workflows/verify-openapi.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: eclipse-edc/.github/.github/actions/setup-build@main
       - run: ./gradlew resolve
-      - uses: actions/upload-artifact@v6
+      - uses: actions/upload-artifact@v7
         with:
           name: openapi-spec
           path: resources/openapi/yaml