Bump cygwin/cygwin-install-action from 4 to 5

Bumps [cygwin/cygwin-install-action](https://github.com/cygwin/cygwin-install-action) from 4 to 5.
- [Release notes](https://github.com/cygwin/cygwin-install-action/releases)
- [Commits](cygwin/cygwin-install-action@v4...v5)

---
updated-dependencies:
- dependency-name: cygwin/cygwin-install-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/ci.yaml

@@ -202,7 +202,7 @@ jobs:
         shell: C:\cygwin\bin\bash.exe --noprofile --norc -o igncr -eo pipefail '{0}'
     steps:
       - uses: actions/checkout@v4
-      - uses: cygwin/cygwin-install-action@v4
+      - uses: cygwin/cygwin-install-action@v5
         with:
           packages: cmake gcc-core ninja