invalidate cache to force clean windows build

Author: Ash-L2L

.github/workflows/windows_builds.yml

@@ -6,7 +6,7 @@ on:
 # SCONS_CACHE for windows must be set in the build environment
 env:
   # Used for the cache key. Add version suffix to force clean build.
-  GODOT_BASE_BRANCH: 4.2
+  GODOT_BASE_BRANCH: 4.2-clean-build-suffix
   SCONSFLAGS: verbose=yes warnings=extra werror=yes module_text_server_fb_enabled=yes
   SCONS_CACHE_MSVC_CONFIG: true