ci: bump Unity version to LTS, Unity Unit Test with LTS.

Author: guitarrapc

.github/workflows/build-debug.yml

@@ -23,7 +23,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        unity: ["2019.3.9f1", "2019.4.13f1", "2020.1.12f1"]
+        unity: ["2021.3.41f1", "2022.3.38f1", "6000.0.11f1"] # Test with LTS
     runs-on: ubuntu-latest
     timeout-minutes: 15
     steps: