fixup to windows installers

.github/workflows/CI.yml

@@ -234,7 +234,7 @@ jobs:
     - name: Fetch Windows executable
       shell: msys2 {0}
       run: |
-        cp fpm-*-windows-*-gcc-${{ matrix.gcc_v }}.exe ./ci/fpm.exe
+        cp fpm-*/fpm-*-windows-*-gcc-${{ matrix.gcc_v }}.exe ./ci/fpm.exe
 
     - name: Fetch Git for Windows
       shell: msys2 {0}