Prepare 2.16.0rc5. (pantsbuild#19221)

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

@@ -169,6 +169,26 @@ The `ToolCustomLockfile` and `ToolDefaultLockfile` classes [have been removed](h
 
 ----
 
+## 2.16.0rc5 (Jun 01, 2023)
+
+### User API Changes
+
+* Deprecate the `version`/`extra_requirements` options on python tools. (Cherry-pick of #19204) ([#19210](https://github.com/pantsbuild/pants/pull/19210))
+
+### Bug Fixes
+
+* Scrub the Pyenv install dir before attempting an install. (Cherry-pick of #19193) ([#19196](https://github.com/pantsbuild/pants/pull/19196))
+
+* Use `{bin_name()} run` as `$0` in `run_shell_command` (Cherry-pick of #19020) ([#19036](https://github.com/pantsbuild/pants/pull/19036))
+
+### Documentation
+
+* Add `tobni` to Maintainers (Cherry-pick of #19195) ([#19206](https://github.com/pantsbuild/pants/pull/19206))
+
+* Add `botocore-a-la-carte` reference to `s3` URL Handler (Cherry-pick of #19055) ([#19108](https://github.com/pantsbuild/pants/pull/19108))
+
+* update scie-jump cache directory reference (Cherry-pick of #18485) ([#19154](https://github.com/pantsbuild/pants/pull/19154))
+
 ## 2.16.0rc4 (May 25, 2023)
 
 ### User API Changes