Bump streetsidesoftware/cspell-action from 5 to 6

Bumps [streetsidesoftware/cspell-action](https://github.com/streetsidesoftware/cspell-action) from 5 to 6.
- [Release notes](https://github.com/streetsidesoftware/cspell-action/releases)
- [Changelog](https://github.com/streetsidesoftware/cspell-action/blob/main/CHANGELOG.md)
- [Commits](streetsidesoftware/cspell-action@v5...v6)

---
updated-dependencies:
- dependency-name: streetsidesoftware/cspell-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/spellcheck.yml

@@ -14,7 +14,7 @@ jobs:
     if: ${{ github.actor != 'dependabot[bot]' }}
     steps:
       - uses: actions/checkout@v4
-      - uses: streetsidesoftware/cspell-action@v5
+      - uses: streetsidesoftware/cspell-action@v6
         with:
           check_dot_files: false
           incremental_files_only: true