Upgrade to Modulith 2.0.0-RC1

See gh-1953

Author: mhalbritter

start-site/src/main/resources/application.yml

@@ -149,7 +149,7 @@ initializr:
           - compatibilityRange: "[3.5.0-M1,4.0.0-M1)"
             version: 1.4.4
           - compatibilityRange: "[4.0.0-M1,4.1.0-M1)"
-            version: 2.0.0-M3
+            version: 2.0.0-RC1
       spring-shell:
         groupId: org.springframework.shell
         artifactId: spring-shell-dependencies