Prepare the 2.16.0rc1 release. (pantsbuild#18803)

src/python/pants/notes/2.16.x.md

@@ -152,6 +152,44 @@ The `ToolCustomLockfile` and `ToolDefaultLockfile` classes [have been removed](h
 
 ----
 
+## 2.16.0rc1 (Apr 23, 2023)
+
+### User API Changes
+
+* Upgrade Pex to 2.1.134. (Cherry-pick of #18785) ([#18789](https://github.com/pantsbuild/pants/pull/18789))
+
+### Bug Fixes
+
+* The `OverridesField.compute_value()` must return a hashable value. (Cherry-pick of #18787) ([#18799](https://github.com/pantsbuild/pants/pull/18799))
+
+* Makes `adhoc_tool` actually respect the `extra_env_vars` field; adds tests (Cherry-pick of #18692) ([#18694](https://github.com/pantsbuild/pants/pull/18694))
+
+* Use address as stable key when batching field sets in `lint`/`test` (Cherry-pick of #18725) ([#18734](https://github.com/pantsbuild/pants/pull/18734))
+
+* Add `ruff` lint rules (Cherry-pick of #18716) ([#18739](https://github.com/pantsbuild/pants/pull/18739))
+
+* Fix `repr` for `Field`s that don't define `default`. (Cherry-pick of #18719) ([#18724](https://github.com/pantsbuild/pants/pull/18724))
+
+* Adds a fully-qualified path to a Python interpreter for `pex_binary` `RunRequest`s (Cherry-pick of #18699) ([#18700](https://github.com/pantsbuild/pants/pull/18700))
+
+* Add timeout to remote store calls, and adjust name of cache timeout. (Cherry-pick of #18695) ([#18697](https://github.com/pantsbuild/pants/pull/18697))
+
+* Bump minimum supported version of Pex to v2.1.129. (Cherry-pick of #18678) ([#18687](https://github.com/pantsbuild/pants/pull/18687))
+
+* Fix JVM resource JAR creation on older Mac OSes (Cherry-pick of #18673) ([#18676](https://github.com/pantsbuild/pants/pull/18676))
+
+### Documentation
+
+* Update linter documentation to refer to `install_from_resolve` (Cherry-pick of #18781) ([#18782](https://github.com/pantsbuild/pants/pull/18782))
+
+* Add PEP 621 `pyproject.toml` file docs (Cherry-pick of #18672) ([#18677](https://github.com/pantsbuild/pants/pull/18677))
+
+* Improve lockfile consumption error message. (Cherry-pick of #18638) ([#18653](https://github.com/pantsbuild/pants/pull/18653))
+
+* Document AWS CDK issue that multiple users have encountered. (Cherry-pick of #18656) ([#18666](https://github.com/pantsbuild/pants/pull/18666))
+
+* Remove a python-specific tip from the general prereqs page. (Cherry-pick of #18637) ([#18650](https://github.com/pantsbuild/pants/pull/18650))
+
 ## 2.16.0rc0 (Mar 31, 2023)
 
 ### Bug fixes