Merge pull request #289 from ProjectMapK/k163377-patch-3

Re-add 2.1.x

Author: k163377

.github/workflows/test-main.yml

@@ -42,7 +42,7 @@ jobs:
         # LTS versions, latest version (if exists)
         java-version: [ '8', '11', '17', '21', '23' ]
         # Minimum version, latest release version, latest pre-release version (if exists)
-        kotlin: ['1.9.25', '2.0.21']
+        kotlin: ['1.9.25', '2.0.21', '2.1.20']
     env:
       KOTLIN_VERSION: ${{ matrix.kotlin }}
     name: "Kotlin ${{ matrix.kotlin }} - Java ${{ matrix.java-version }}"