Upgrade Spring Modulith to 1.3.0

See gh-1651

Author: odrotbohm

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

@@ -126,8 +126,7 @@ initializr:
           - compatibilityRange: "[3.3.0,3.4.0-M1)"
             version: 1.2.4
           - compatibilityRange: "[3.4.0,3.5.0-M1)"
-            version: 1.3.0-M3
-            repositories: spring-milestones
+            version: 1.3.0
       spring-shell:
         groupId: org.springframework.shell
         artifactId: spring-shell-dependencies