chore: bump streetsidesoftware/cspell-action from 7 to 8

Bumps [streetsidesoftware/cspell-action](https://github.com/streetsidesoftware/cspell-action) from 7 to 8.
- [Release notes](https://github.com/streetsidesoftware/cspell-action/releases)
- [Changelog](https://github.com/streetsidesoftware/cspell-action/blob/main/CHANGELOG.md)
- [Commits](streetsidesoftware/cspell-action@v7...v8)

---
updated-dependencies:
- dependency-name: streetsidesoftware/cspell-action
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci-markdown-checks.yml

@@ -45,7 +45,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: streetsidesoftware/cspell-action@v7
+      - uses: streetsidesoftware/cspell-action@v8
         with:
           # Files should be consistent with check:spelling files
           files: |