Bump cygwin/cygwin-install-action from 3 to 4

Bumps [cygwin/cygwin-install-action](https://github.com/cygwin/cygwin-install-action) from 3 to 4.
- [Release notes](https://github.com/cygwin/cygwin-install-action/releases)
- [Commits](cygwin/cygwin-install-action@v3...v4)

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

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

Author: dependabot[bot]

.github/workflows/cygwin.yml

@@ -82,7 +82,7 @@ jobs:
         with:
           fetch-depth: 0
 
-      - uses: cygwin/cygwin-install-action@v3
+      - uses: cygwin/cygwin-install-action@v4
         with:
           packages: >-
             ccache gcc-g++ gdb git graphviz libcairo-devel libffi-devel