Remove option to enable bzlmod

since it's enabled by default since bazel 7. Also remove comment to
migrate dependencies to MODULE.bazel since that has been finished now.

Change-Id: I7192ad4f0be88fab5bb40ecbea0aef9d57bb3466

.bazelrc

diff --git a/.bazelrc b/.bazelrc
index 8235a8e..0006880 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -1,8 +1,3 @@
-# TODO(davido): Migrate all dependencies from WORKSPACE to MODULE.bazel
-# https://issues.gerritcodereview.com/issues/303819949
-
-common --enable_bzlmod
-
 build --workspace_status_command="python3 ./tools/workspace_status.py"
 build --repository_cache=~/.gerritcodereview/bazel-cache/repository
 build --incompatible_strict_action_env