Bump actions/upload-artifact from 3 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Publish
         run: dotnet publish --configuration Release --no-restore
       - name: Upload artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: open-cue-service
           path: bin/Release/net7.0/win-x64/publish/

.github/workflows/pages.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Generate openapi.json
         run: dotnet nswag run nswag.json
       - name: Upload openapi.json
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: spec-file
           path: openapi.json