build(deps): bump streetsidesoftware/cspell-action from 2.18.0 to 2.20.0

Bumps [streetsidesoftware/cspell-action](https://github.com/streetsidesoftware/cspell-action) from 2.18.0 to 2.20.0.
- [Release notes](https://github.com/streetsidesoftware/cspell-action/releases)
- [Changelog](https://github.com/streetsidesoftware/cspell-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/streetsidesoftware/cspell-action/compare/v2.18.0...v2.20.0)

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

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

.github/workflows/spell.yml

@@ -8,4 +8,4 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3.3.0
-      - uses: streetsidesoftware/cspell-action@v2.18.0
+      - uses: streetsidesoftware/cspell-action@v2.20.0