Allow building when Python lib cannot be chowned

When building Gerrit on MacOS and bazel mods, the build may fail with:
"Error in fail: Failed to make interpreter installation read-only.
'chmod' error msg"

The error happens when trying to perform a chmod of the Python lib,
which the current user may not have permission to change.

Relaxing the ignore_root_user_error flag solves the problem.

The associated Bazel issue at [1] and has later fixed with [2].

[1] bazel-contrib/rules_python#2016
[2] bazel-contrib/rules_python#3421

Release-Notes: skip
Change-Id: I326025b80a644a2a485ee936b4cfe1429d9d81f2

Author: lucamilanesio

MODULE.bazel

@@ -8,6 +8,7 @@ bazel_dep(name = "rules_shell", version = "0.6.1")
 bazel_dep(name = "rules_java", version = "7.6.1")
 bazel_dep(name = "toolchains_protoc", version = "0.3.0")
 bazel_dep(name = "rules_proto", version = "6.0.0")
+bazel_dep(name = "rules_python", version = "1.8.0-rc1")
 
 bazel_dep(name = "jgit")
 local_path_override(