Remove snapshot repo logic for version overrides

We have no way of doing version overrides any more. Also I made all the
explicit versions into properties, so keeping Boot in the list would
mean the snapshot repo is always added, which isn't what we want.

build.gradle

@@ -37,10 +37,7 @@ allprojects {
 		if (!version.endsWith('RELEASE')) {
 			maven { url "https://repo.spring.io/milestone" }
 		}
-		if (version.endsWith('BUILD-SNAPSHOT') ||
-			project.hasProperty("springFrameworkVersion") ||
-			project.hasProperty("springBootVersion") ||
-			project.hasProperty("reactorVersion")) {
+		if (version.endsWith('BUILD-SNAPSHOT')) {
 			maven { url "https://repo.spring.io/snapshot" }
 		}
 	}