Update GitHub Actions to run on MacBook and Ubuntu

The GitHub Actions workflow has been updated to run on both MacBook Air 15 M2 24GB and Ubuntu as opposed to just Ubuntu. This will likely improve testing across different operating systems and catch potential OS-specific bugs earlier.

.github/workflows/maven-publish.yml

@@ -13,7 +13,7 @@ on:
 jobs:
   build:
     runs-on:
-      - MacBook Air 15 M2 24GB
+      - self-hosted
       - ubuntu-latest
 
     steps: