[github-actions] Update build workflow to use windows-latest

Author: nikias

.github/workflows/build.yml

@@ -116,7 +116,7 @@ jobs:
         name: libirecovery-latest_macOS
         path: libirecovery.tar
   build-windows:
-    runs-on: windows-2019
+    runs-on: windows-latest
     defaults:
       run:
         shell: msys2 {0}
@@ -137,6 +137,7 @@ jobs:
           base-devel
           git
           mingw-w64-${{ matrix.arch }}-gcc
+          mingw-w64-${{ matrix.arch }}-pkg-config
           make
           libtool
           autoconf