chore: updating release note and changelog

Author: darklight3it

aws-lambda-java-log4j2/README.md

@@ -10,7 +10,7 @@ Example for Maven pom.xml
   <dependency>
     <groupId>com.amazonaws</groupId>
     <artifactId>aws-lambda-java-log4j2</artifactId>
-    <version>1.6.3</version>
+    <version>1.6.4</version>
   </dependency>
   <dependency>
     <groupId>org.apache.logging.log4j</groupId>
@@ -73,7 +73,7 @@ If you are using the [John Rengelman](https://github.com/johnrengelman/shadow) G
 
 dependencies{
   ...
-    implementation group: 'com.amazonaws', name: 'aws-lambda-java-log4j2', version: '1.6.3'
+    implementation group: 'com.amazonaws', name: 'aws-lambda-java-log4j2', version: '1.6.4'
     implementation group: 'org.apache.logging.log4j', name: 'log4j-core', version: log4jVersion
     implementation group: 'org.apache.logging.log4j', name: 'log4j-api', version: log4jVersion
 }

aws-lambda-java-log4j2/RELEASE.CHANGELOG.md

@@ -1,3 +1,7 @@
+### May 19, 2026
+`1.6.4`:
+- Fix regression in `1.6.3`
+
 ### May 13, 2026
 `1.6.3`:
 - Updated `log4j-core` and `log4j-api` dependencies to `2.25.4`