chore(deps): bump egor-tensin/setup-cygwin from 3 to 4

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

---
updated-dependencies:
- dependency-name: egor-tensin/setup-cygwin
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/msys2-cygwin.yml

@@ -62,7 +62,7 @@ jobs:
       with:
         submodules: true
 
-    - uses: egor-tensin/setup-cygwin@v3
+    - uses: egor-tensin/setup-cygwin@v4
       with:
         platform: x86
         packages: git make cmake gcc-g++ ninja