Bump actions/upload-artifact from 5 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/docker-image.yml

@@ -33,7 +33,7 @@ jobs:
           tags: |
             ${{ env.IMAGE_NAME }}:lint
       - name: "LINT: Upload artifact"
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ env.ARTIFACT_NAME }}_lint
           path: /tmp/${{ env.ARTIFACT_NAME }}_lint.tar
@@ -48,7 +48,7 @@ jobs:
           tags: |
             ${{ env.IMAGE_NAME }}:test
       - name: "TEST: Upload artifact"
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ env.ARTIFACT_NAME }}_test
           path: /tmp/${{ env.ARTIFACT_NAME }}_test.tar
@@ -64,7 +64,7 @@ jobs:
             ${{ env.IMAGE_NAME }}:latest
             ${{ env.IMAGE_NAME }}:${{ github.sha }}
       - name: "PRODUCTION: Upload artifact"
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ env.ARTIFACT_NAME }}_prod
           path: /tmp/${{ env.ARTIFACT_NAME }}_prod.tar