build(deps): bump streetsidesoftware/cspell-action from 8.3.0 to 8.4.0

Bumps [streetsidesoftware/cspell-action](https://github.com/streetsidesoftware/cspell-action) from 8.3.0 to 8.4.0.
- [Release notes](https://github.com/streetsidesoftware/cspell-action/releases)
- [Changelog](https://github.com/streetsidesoftware/cspell-action/blob/main/CHANGELOG.md)
- [Commits](9cd41bb518...de2a73e963)

---
updated-dependencies:
- dependency-name: streetsidesoftware/cspell-action
  dependency-version: 8.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/spellcheck.yaml

@@ -20,7 +20,7 @@ jobs:
           persist-credentials: false
 
       - name: Check Spelling
-        uses: streetsidesoftware/cspell-action@9cd41bb518a24fefdafd9880cbab8f0ceba04d28  # 8.3.0
+        uses: streetsidesoftware/cspell-action@de2a73e963e7443969755b648a1008f77033c5b2  # 8.4.0
         with:
           files: |
             **/*.md