Prepare 2.2.3rc0 (pantsbuild#11991)

[ci skip-rust]

src/python/pants/notes/2.2.x.md

@@ -6,6 +6,12 @@ This is the first release to require having a Python 3.7 or 3.8 interpreter to r
 https://raw.githubusercontent.com/pantsbuild/setup/2f079cbe4fc6a1d9d87decba51f19d7689aee69e/pants` to update your
 `./pants` script to choose the correct interpreter.
 
+## 2.2.3rc0 (Apr 29, 2021)
+
+### User API Changes
+
+* Revert deprecation of `interpreter_constraints` field for `pex_binary` and `python_awslambda` ([#11981](https://github.com/pantsbuild/pants/pull/11981))
+
 ## 2.2.2 (Apr 20, 2021)
 
 The third stable release of the `2.2.x` series, with no changes since the previous `rc`.