ci: Temporarily disable cygwin test

```
+ choco install --no-progress --requirechecksums cygwin
Chocolatey v2.6.0
Installing the following packages:
cygwin
By installing, you accept licenses for the packages.
Downloading package from source 'https://community.chocolatey.org/api/v2/'

Cygwin v3.6.6 [Approved]
Cygwin package files install completed. Performing other installation steps.
Download site: http://mirrors.kernel.org/sourceware/cygwin/
Installing 64-bit Cygwin...
ERROR: Running ["C:\ProgramData\chocolatey\lib\Cygwin\tools\setup-x86_64.exe" --quiet-mode --site "http://mirrors.kernel.org/sourceware/cygwin/" --packages default --root "C:\tools\cygwin" --local-package-dir "C:\tools\cygwin" --no-desktop] was not successful. Exit code was '1'. See log for possible error messages.
Environment Vars (like PATH) have changed. Close/reopen your shell to
 see the changes (or in powershell/cmd.exe just type `refreshenv`).
The install of Cygwin was NOT successful.
Error while running 'C:\ProgramData\chocolatey\lib\Cygwin\tools\chocolateyInstall.ps1'.
 See log for details.

Chocolatey installed 0/1 packages. 1 packages failed.
 See the log for details (C:\ProgramData\chocolatey\logs\chocolatey.log).

Failures
 - Cygwin (exited 1) - Error while running 'C:\ProgramData\chocolatey\lib\Cygwin\tools\chocolateyInstall.ps1'.
 See log for details.

Did you know the proceeds of Pro (and some proceeds from other
 licensed editions) go into bettering the community infrastructure?
 Your support ensures an active community, keeps Chocolatey tip-top,
 plus it nets you some awesome features!
 https://chocolatey.org/compare
```

.github/workflows/ci.yml

@@ -77,13 +77,13 @@ jobs:
           - os: windows-2022
           - os: windows-2022
             bash: msys64
-          - os: windows-2022
-            bash: cygwin
+          # - os: windows-2022
+          #   bash: cygwin
           - os: windows-2025
           - os: windows-2025
             bash: msys64
-          - os: windows-2025
-            bash: cygwin
+          # - os: windows-2025
+          #   bash: cygwin
           - os: windows-11-arm
           - os: windows-2022
             tool: major.minor.patch