update changelog for 1.4

Author: aignas

CHANGELOG.md

@@ -103,8 +103,6 @@ END_UNRELEASED_TEMPLATE
     * 3.12.9
     * 3.13.2
 * (pypi) Use `xcrun xcodebuild --showsdks` to find XCode root.
-* (pypi) The `bzlmod` extension will now generate smaller lock files for  when
-  using `experimental_index_url`.
 * (toolchains) Remove all but `3.8.20` versions of the Python `3.8` interpreter who has
   reached EOL. If users still need other versions of the `3.8` interpreter, please supply
   the URLs manually {bzl:obj}`python.toolchain` or {bzl:obj}`python_register_toolchains` calls.
@@ -120,13 +118,6 @@ END_UNRELEASED_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