feat: bump to 4.2.2

Author: anzheyazzz

RELEASE.CHANGELOG.md

@@ -1,3 +1,7 @@
+### October 15, 2026
+`4.2.2`
+- Pin the worker process start method to `fork` in multi-concurrent (Lambda Managed Instances) mode instead of inheriting the interpreter default, which changed from `fork` to `forkserver` in Python 3.14. Workers are now direct children of the runtime process on every supported Python version ([#233](https://github.com/aws/aws-lambda-python-runtime-interface-client/pull/233)). No behavior change on Python 3.13 and earlier; no impact on the standard on-demand path.
+
 ### October 13, 2026
 `4.2.1`
 - Revert pre-fork hooks for multi-concurrent (Lambda Managed Instances) mode introduced in `4.1.0` ([#226](https://github.com/aws/aws-lambda-python-runtime-interface-client/pull/226)), as the change was breaking. The `awslambdaric.lambda_concurrency_hooks` module, the `@register_pre_fork` decorator and the `Runtime.PreForkError` error type are removed, restoring the `4.0.4` multi-concurrent startup behavior. No impact on the standard on-demand path.

awslambdaric/__init__.py

@@ -2,4 +2,4 @@
 Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 """
 
-__version__ = "4.2.1"
+__version__ = "4.2.2"