Bump cygwin/cygwin-install-action from 5 to 6

Bumps [cygwin/cygwin-install-action](https://github.com/cygwin/cygwin-install-action) from 5 to 6. - [Release notes](https://github.com/cygwin/cygwin-install-action/releases) - [Commits](cygwin/cygwin-install-action@v5...v6) --- updated-dependencies: - dependency-name: cygwin/cygwin-install-action 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/cygwin-test.yml

@@ -39,7 +39,7 @@ jobs:
 fetch-depth: 0
 
  - name: Install Cygwin
-uses: cygwin/cygwin-install-action@v5
+uses: cygwin/cygwin-install-action@v6
 with:
 packages: git python39 python-pip-wheel python-setuptools-wheel python-wheel-wheel
 add-to-path: false # No need to change $PATH outside the Cygwin environment.