Explicitly depend on rules_proto

This is not a true dependency. We do it to fake out the transitive dependency checking for compatibility.
What we really want is the dependency from rules_python to win.

modules/rules_pkg/1.0.0/MODULE.bazel

@@ -10,6 +10,10 @@ bazel_dep(name = "rules_license", version = "0.0.7")
 bazel_dep(name = "rules_python", version = "0.31.0")
 bazel_dep(name = "bazel_skylib", version = "1.4.2")
 
+# This is just to please module compatibility_level checking. We should not
+# specify it ourselves, but use what rules_python expects
+bazel_dep(name = "rules_proto", version = "6.0.0-rc3", dev_dependency = True)
+
 # Only for development
 bazel_dep(name = "platforms", version = "0.0.9", dev_dependency = True)
 bazel_dep(name = "rules_cc", version = "0.0.9", dev_dependency = True)