chore(deps): bump actions/download-artifact from 7 to 8 (#185)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 7 to 8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v7...v8)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '8'
  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

@@ -37,7 +37,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - uses: eclipse-edc/.github/.github/actions/setup-build@main
-      - uses: actions/download-artifact@v7
+      - uses: actions/download-artifact@v8
         with:
           name: openapi-spec
           path: resources/openapi/yaml
@@ -81,7 +81,7 @@ jobs:
     needs: generate-swagger-ui
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/download-artifact@v7
+      - uses: actions/download-artifact@v8
         with:
           path: openapi
           pattern: "*-api"

.github/workflows/verify-openapi.yml

@@ -37,7 +37,7 @@ jobs:
         with:
           fetch-depth: 0
       - uses: eclipse-edc/.github/.github/actions/setup-build@main
-      - uses: actions/download-artifact@v7
+      - uses: actions/download-artifact@v8
         with:
           name: openapi-spec
           path: resources/openapi/yaml