ci: use windows 2025 for i686-mingw

Author: marcoieni

src/ci/github-actions/jobs.yml

@@ -43,6 +43,10 @@ runners:
     os: windows-2022-8core-32gb
     <<: *base-job
 
+  - &job-windows-25-8c
+    os: windows-2025-8core-32gb
+    <<: *base-job
+
   - &job-aarch64-linux
     # Free some disk space to avoid running out of space during the build.
     free_disk: true
@@ -524,7 +528,7 @@ auto:
       # We are intentionally allowing an old toolchain on this builder (and that's
       # incompatible with LLVM downloads today).
       NO_DOWNLOAD_CI_LLVM: 1
-    <<: *job-windows-8c
+    <<: *job-windows-25-8c
 
   # x86_64-mingw is split into two jobs to run tests in parallel.
   - name: x86_64-mingw-1