Bump actions/upload-artifact from 5 to 6 (#77)

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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/push.yaml

@@ -34,7 +34,7 @@ jobs:
         run: make build-darwin-amd64
 
       - name: Upload binaries
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: always()
         with:
           name: kube-review-darwin-amd64
@@ -56,7 +56,7 @@ jobs:
         run: make build-darwin-arm64
 
       - name: Upload binaries
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: always()
         with:
           name: kube-review-darwin-arm64
@@ -78,7 +78,7 @@ jobs:
         run: make build-linux-amd64
 
       - name: Upload binaries
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: always()
         with:
           name: kube-review-linux-amd64
@@ -100,7 +100,7 @@ jobs:
         run: make build-windows-amd64
 
       - name: Upload binaries
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: always()
         with:
           name: kube-review-windows-amd64