CI: use a newer ubuntu for the cross build

24.10 is EOL

Author: lazka

.github/workflows/mingw.yml

@@ -166,7 +166,7 @@ jobs:
   cross-gcc-x86_64:
     runs-on: ubuntu-latest
     container:
-      image: ubuntu:24.10
+      image: ubuntu:25.04
     steps:
       - uses: actions/checkout@v4
       - name: Install deps