GH-2157 - Set up 2.3.x branch.

Author: odrotbohm

.github/workflows/build.yaml

@@ -2,7 +2,7 @@ name: CI Build
 
 on:
   push:
-    branches: [ main, 2.2.x, 2.1.x, 2.0.x, 1.5.x ]
+    branches: [ main, 2.3.x, 2.2.x, 2.1.x, 2.0.x, 1.5.x ]
   pull_request:
     branches: [ main ]
 

.github/workflows/compatibility.yaml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        branch: ['main', '2.2.x', '2.1.x']
+        branch: ['main', '2.3.x', '2.2.x', '2.1.x']
         spring: ['', 'spring-next', 'spring-61-next']
         kotlin: ['', 'kotlin-next', 'kotlin-2-next']
         jackson: ['', 'jackson-next']