feat: flip pipstar to be on by default

Author: aignas

CHANGELOG.md

@@ -81,6 +81,10 @@ END_UNRELEASED_TEMPLATE
 * (pip) `pipstar` has been enabled for all `whl_library` instances where the whl
   is passed through a label or downloaded using the bazel downloader
   ([#2949](https://github.com/bazel-contrib/rules_python/issues/2949)).
+* (pypi) `pipstar` flag default has been flipped to be on by default.
+  It can be disabled through `RULES_PYTHON_ENABLE_PIPSTAR=0` environment variable. 
+  If you do need to disable it, please add a comment to
+  [#2949](https://github.com/bazel-contrib/rules_python/issues/2949).
 * (gazelle deps) rules_go bumped from 0.55.1 to 0.59.0
 * (gazelle deps) gazelle bumped from 0.36.0 to 0.47.0
 

python/private/internal_config_repo.bzl

@@ -22,7 +22,7 @@ load("//python/private:text_util.bzl", "render")
 load(":repo_utils.bzl", "repo_utils")
 
 _ENABLE_PIPSTAR_ENVVAR_NAME = "RULES_PYTHON_ENABLE_PIPSTAR"
-_ENABLE_PIPSTAR_DEFAULT = "0"
+_ENABLE_PIPSTAR_DEFAULT = "1"
 _ENABLE_DEPRECATION_WARNINGS_ENVVAR_NAME = "RULES_PYTHON_DEPRECATION_WARNINGS"
 _ENABLE_DEPRECATION_WARNINGS_DEFAULT = "0"