Merge branch 'reenable-msys2-ci' into 'main'

Reenable MSYS2 CI

See merge request GNOME/glib!4870

.gitlab-ci.yml

@@ -562,16 +562,14 @@ cross-mingw64:
 # This policy doesn’t apply to intermittent flaky test failures, only to
 # consistent build failures caused by changed dependencies or build environment.
 msys2-mingw32:
-  # FIXME: Currently disabled because it’s too flaky and keeps failing with
-  # subproject fetch errors
-  # See https://gitlab.gnome.org/GNOME/glib/-/issues/3715
-  when: manual
   extends: .only-default-and-merges
   stage: build
   tags:
     - win32-ps
   needs: []
   variables:
+    GIT_SUBMODULE_STRATEGY: recursive
+    GIT_SUBMODULE_DEPTH: 1
     MSYSTEM: "MINGW32"
     CHERE_INVOKING: "yes"
     COVERAGE: "1"
@@ -603,6 +601,8 @@ msys2-clang64:
     - win32-ps
   needs: []
   variables:
+    GIT_SUBMODULE_STRATEGY: recursive
+    GIT_SUBMODULE_DEPTH: 1
     MSYSTEM: "CLANG64"
     CHERE_INVOKING: "yes"
     PYTHONUTF8: "1"