Bump actions/upload-artifact from 3 to 4 (#139)

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

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  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>

.github/workflows/maven.yml

@@ -89,7 +89,7 @@ jobs:
       - name: Build this branch
         run: ./mvnw -DskipTests -Dimage.version=CI_ONLY --batch-mode -no-transfer-progress package jib:dockerBuild --file pom.xml
       - name: 'Upload artifact'
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: planetiler-build
           path: target/*with-deps.jar