ci: windows: install gnupg separately

Author: LDVG

.github/workflows/windows_builds.yml

@@ -29,6 +29,9 @@ jobs:
           - os: windows-2025
             arch: ARM
     steps:
+    - name: dependencies
+      shell: pwsh
+      run: choco install gnupg
     - uses: actions/checkout@v4
     - name: build
       shell: pwsh