Update v2 deprecation date

Author: angelapwen

CHANGELOG.md

@@ -6,7 +6,7 @@ Note that the only difference between `v2` and `v3` of the CodeQL Action is the
 
 ## [UNRELEASED]
 
-No user facing changes.
+- _Upcoming deprecation_: Update a deprecation warning for customers using CodeQL Action v2, on compatible GitHub versions. Support for CodeQL Action v2 will end on January 29, 2025. [#2520](https://github.com/github/codeql-action/pull/2670)
 
 ## 3.28.0 - 20 Dec 2024
 

README.md

@@ -63,7 +63,7 @@ For compiled languages:
 The following versions of the CodeQL Action are currently supported:
 
 - v3 (latest)
-- v2 (deprecated, support will end on December 5th, 2024)
+- v2 (deprecated, support will end on January 29, 2025)
 
 The only difference between CodeQL Action v2 and v3 is the version of Node.js on which they run. CodeQL Action v3 runs on Node 20, while CodeQL Action v2 runs on Node 16.