Change rules_cc compatibility proxy version check

We can't wait till the actual release since we want to delete the rules before then, and that would break Bazel's bootstrap process.

PiperOrigin-RevId: 805870065
Change-Id: I3adcea2cd6b443a9d309ee687dd3e744df0d5837
diff --git a/cc/extensions.bzl b/cc/extensions.bzl
index 102b438..6252622 100644
--- a/cc/extensions.bzl
+++ b/cc/extensions.bzl
@@ -28,7 +28,7 @@
 cc_configure_extension = module_extension(implementation = _cc_configure_extension_impl)
 
 def _compatibility_proxy_repo_impl(rctx):
-    if _bazel_version_ge("9.0.0"):
+    if _bazel_version_ge("9.0.0-pre.20250911"):
         rctx.file(
             "BUILD",
             """