address comments and add docs

Author: aignas

.github/workflows/mypy.yaml

@@ -1,4 +1,3 @@
----
 name: mypy
 
 on:

CHANGELOG.md

@@ -81,6 +81,13 @@ Unreleased changes template.
   [PR #2746](https://github.com/bazel-contrib/rules_python/pull/2746).
 * (rules) {attr}`py_binary.srcs` and {attr}`py_test.srcs` is no longer mandatory when
   `main_module` is specified (for `--bootstrap_impl=script`)
+* (pypi) From now on the `Requires-Dist` from the wheel metadata is analysed in
+  the loading phase instead of repository rule phase giving better caching
+  performance when the target platforms are changed (e.g. target python
+  versions). This is preparatory work for stabilizing the cross-platform wheel
+  support. From now on the usage of `experimental_target_platforms` should be
+  avoided and the `requirements_by_platform` values should be instead used to
+  specify the target platforms for the given dependencies.
 
 [20250317]: https://github.com/astral-sh/python-build-standalone/releases/tag/20250317
 

python/private/pypi/attrs.bzl

@@ -123,6 +123,9 @@ Warning:
     "experimental_target_platforms": attr.string_list(
         default = [],
         doc = """\
+*NOTE*: This will be removed in the next major version, so please consider migrating
+to `bzlmod` and rely on {attr}`pip.parse.requirements_by_platform` for this feature.
+
 A list of platforms that we will generate the conditional dependency graph for
 cross platform wheels by parsing the wheel metadata. This will generate the
 correct dependencies for packages like `sphinx` or `pylint`, which include