ci(mingw): print msys2 packages

Also lists theirs versions, which is useful for debugging issues like
those fixed in https://github.com/PrismLauncher/PrismLauncher/pull/3756

Signed-off-by: seth <getchoo@tuta.io>

.github/actions/setup-dependencies/windows/action.yml

@@ -25,7 +25,7 @@ runs:
         arch: ${{ inputs.vcvars-arch }}
         vsversion: 2022
 
-    - name: Setup MSYS2 (MinGW-64)
+    - name: Setup MSYS2 (MinGW)
       if: ${{ inputs.msystem != '' }}
       uses: msys2/setup-msys2@v2
       with:
@@ -48,6 +48,12 @@ runs:
           tomlplusplus:p
           quazip-qt6:p
 
+    - name: List pacman packages (MinGW)
+      if: ${{ inputs.msystem != '' }}
+      shell: msys2 {0}
+      run: |
+        pacman -Qe
+
     - name: Retrieve ccache cache (MinGW)
       if: ${{ inputs.msystem != '' && inputs.build-type == 'Debug' }}
       uses: actions/cache@v4.2.3