build(deps): 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/release.yml

@@ -42,7 +42,7 @@ jobs:
         xz "$REL_TAR"
         sha256sum "$REL_TAR.xz" > "$REL_TAR.xz.sha256sum"
     - name: Upload Artifacts
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: rmw_dist_archive
         path: ${{ github.workspace }}/builddir/meson-dist/*
@@ -89,7 +89,7 @@ jobs:
           sha256sum "$IMAGE_FILENAME" > "$IMAGE_FILENAME.sha256sum"
 
       - name: Upload AppImage
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ env.IMAGE_FILENAME }}
           path: ./out/*
@@ -125,7 +125,7 @@ jobs:
         sha256sum "$DEB_FILENAME" > "../$DEB_FILENAME.sha256sum"
 
     - name: Upload Artifacts
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: ${{ env.DEB_FILENAME }}
         path: |