Update main plugin to Java 17

All supported versions require Java 17, there's no reason the plugin should not.
Swap to Temurin for CI, Adopt is dead.

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
 
       - uses: actions/setup-java@v3
         with:
-          distribution: 'adopt'
+          distribution: 'temurin'
           java-version: '17'
           cache: 'maven'