build(deps): bump msys2/setup-msys2 from 2.20.1 to 2.21.0

Bumps [msys2/setup-msys2](https://github.com/msys2/setup-msys2) from 2.20.1 to 2.21.0.
- [Release notes](https://github.com/msys2/setup-msys2/releases)
- [Changelog](https://github.com/msys2/setup-msys2/blob/main/CHANGELOG.md)
- [Commits](msys2/setup-msys2@27b3aa7...76b1bed)

---
updated-dependencies:
- dependency-name: msys2/setup-msys2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/windows_test_npm_install.yml

@@ -144,7 +144,7 @@ jobs:
       # Install MSYS2:
       - name: 'Install MSYS2'
         # Pin action to full length commit SHA corresponding to v2.20.1
-        uses: msys2/setup-msys2@27b3aa77f672cb6b3054121cfd80c3d22ceebb1d
+        uses: msys2/setup-msys2@76b1bed68bac51ebe46cb431077217d4b98e2b7b
         with:
           # Set the MSYS system:
           msystem: MINGW64