github-actions(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/e2e.yml

@@ -152,15 +152,15 @@ jobs:
 
             - name: Upload core playwright snapshots artifact
               if: failure() && matrix.package == 'core'
-              uses: actions/upload-artifact@v4
+              uses: actions/upload-artifact@v6
               with:
                   name: playwright-snapshots
                   path: core/test-results
                   retention-days: 10
 
             - name: Upload context-editor playwright snapshots artifact
               if: failure() && matrix.package == 'context-editor'
-              uses: actions/upload-artifact@v4
+              uses: actions/upload-artifact@v6
               with:
                   name: playwright-snapshots
                   path: packages/context-editor/test-results