[release] post-release version bump

doc/changelog.markdown

@@ -1,6 +1,9 @@
 Lombok Changelog
 ----------------
 
+### v1.18.31 "Edgy Guinea Pig"
+* We recently released v1.18.30; there is no edge release since then.
+
 ### v1.18.30 (September 20th, 2023)
 * PLATFORM: Initial JDK21 support added. [Issue #3393](https://github.com/projectlombok/lombok/issues/3393).
 * BUGFIX: Any `@Helper` class directly in a method (and not nested more deeply) wouldn't work. [Issue #3370](https://github.com/projectlombok/lombok/issues/3370).

src/core/lombok/core/Version.java

@@ -30,9 +30,9 @@ public class Version {
 	// ** CAREFUL ** - this class must always compile with 0 dependencies (it must not refer to any other sources or libraries).
 	// Note: In 'X.Y.Z', if Z is odd, its a snapshot build built from the repository, so many different 0.10.3 versions can exist, for example.
 	// Official builds always end in an even number. (Since 0.10.2).
-	private static final String VERSION = "1.18.30";
-//	private static final String RELEASE_NAME = "Edgy Guinea Pig";
-	private static final String RELEASE_NAME = "Envious Ferret";
+	private static final String VERSION = "1.18.31";
+	private static final String RELEASE_NAME = "Edgy Guinea Pig";
+//	private static final String RELEASE_NAME = "Envious Ferret";
 	
 	// Named version history:
 	//   Angry Butterfly