build(deps): bump seanmiddleditch/gha-setup-ninja from 4 to 6

Bumps [seanmiddleditch/gha-setup-ninja](https://github.com/seanmiddleditch/gha-setup-ninja) from 4 to 6.
- [Release notes](https://github.com/seanmiddleditch/gha-setup-ninja/releases)
- [Commits](seanmiddleditch/gha-setup-ninja@v4...v6)

---
updated-dependencies:
- dependency-name: seanmiddleditch/gha-setup-ninja
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/CI.yml

@@ -55,7 +55,7 @@ jobs:
 
       - name: Install ninja-build tool for aws-lc-fips-sys on Windows
         if: runner.os == 'Windows'
-        uses: seanmiddleditch/gha-setup-ninja@v4
+        uses: seanmiddleditch/gha-setup-ninja@v6
 
 
       - name: Test