fix: add pythons_hub to internal_setup

Author: aignas

internal_setup.bzl

@@ -22,13 +22,25 @@ load("@rules_bazel_integration_test//bazel_integration_test:deps.bzl", "bazel_in
 load("@rules_bazel_integration_test//bazel_integration_test:repo_defs.bzl", "bazel_binaries")
 load("@rules_proto//proto:repositories.bzl", "rules_proto_dependencies", "rules_proto_toolchains")
 load("//:version.bzl", "SUPPORTED_BAZEL_VERSIONS")
+load("//python/private:bzlmod_enabled.bzl", "BZLMOD_ENABLED")  # buildifier: disable=bzl-visibility
 load("//python/private:internal_config_repo.bzl", "internal_config_repo")  # buildifier: disable=bzl-visibility
+load("//python/private:pythons_hub.bzl", "hub_repo")  # buildifier: disable=bzl-visibility
 load("//python/private/pypi:deps.bzl", "pypi_deps")  # buildifier: disable=bzl-visibility
 
 def rules_python_internal_setup():
     """Setup for rules_python tests and tools."""
 
     internal_config_repo(name = "rules_python_internal")
+    if not BZLMOD_ENABLED:
+        hub_repo(
+            name = "pythons_hub",
+            minor_mapping = {},
+            default_python_version = "",
+            toolchain_prefixes = [],
+            toolchain_python_versions = [],
+            toolchain_set_python_version_constraints = [],
+            toolchain_user_repository_names = [],
+        )
 
     # Because we don't use the pip_install rule, we have to call this to fetch its deps
     pypi_deps()