chore(deps): bump actions/upload-artifact from 4 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...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/container.yml

@@ -98,7 +98,7 @@ jobs:
 
       # Upload digest
       - name: Upload digest
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ env.ARTIFACT_NAME }}
           path: /tmp/digests/*

.github/workflows/update-stores.yml

@@ -118,7 +118,7 @@ jobs:
 
       - name: Save Store Types JSON Artifact
         if: success()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: store-types
           path: |
@@ -127,14 +127,14 @@ jobs:
 
       - name: Save Invalid Store Types JSON Artifact
         if: success()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: invalid-repos
           path: ./tools/store-type-merge/invalid_repos.json
 
       - name: Save logs directory
         if: success()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: logs
           path: ./tools/store-type-merge/log