chore: updates fullstack demo deps

Author: anthonydmays

lib/java/fullstack_demo/build.gradle.kts

@@ -14,12 +14,6 @@ apply(plugin = "io.spring.dependency-management")
 group = "com.codedifferently"
 version = "0.0.1-SNAPSHOT"
 
-java {
-	toolchain {
-		languageVersion = JavaLanguageVersion.of(17)
-	}
-}
-
 repositories {
 	mavenCentral()
 }