Fix setup-msys2 pin to valid commit SHA (v2.30.0)

The previous SHA was invalid, causing "Set up job" to fail immediately.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: wesm

.github/workflows/release.yml

@@ -167,7 +167,7 @@ jobs:
 
       - name: Set up MinGW
         id: msys2
-        uses: msys2/setup-msys2@d40200dc2f5f4942b8ceff329b5499042d157699 # v2
+        uses: msys2/setup-msys2@4f806de0a5a7294ffabaff804b38a9b435a73bda # v2.30.0
         with:
           msystem: MINGW64
           install: mingw-w64-x86_64-gcc