Disable Bzlmod explicitly in .bazelrc

This will help make sure [Bazel Downstream Pipeline](https://github.com/bazelbuild/continuous-integration/blob/master/docs/downstream-testing.md) is green after enabling Bzlmod at Bazel@HEAD

See https://github.com/bazelbuild/bazel/issues/18958#issuecomment-1749058780

Related https://github.com/protocolbuffers/protobuf/issues/14313

Closes: https://github.com/protocolbuffers/protobuf/pull/14314
PiperOrigin-RevId: 572920528
diff --git a/MODULE.bazel b/MODULE.bazel
new file mode 100644
index 0000000..2d43e46
--- /dev/null
+++ b/MODULE.bazel
@@ -0,0 +1,2 @@
+# TODO: migrate all dependencies from WORKSPACE to MODULE.bazel
+# https://github.com/protocolbuffers/protobuf/issues/14313