Remove explicit empty version argument

This is currently incompatible with the Publish to BCR app.

MODULE.bazel

@@ -1,8 +1,7 @@
 module(
     name = "gazelle",
-    # Updated by the Publish to BCR app.
-    version = "",
     repo_name = "bazel_gazelle",
+    # version is set by the Publish to BCR app.
 )
 
 bazel_dep(name = "bazel_features", version = "1.9.1")