Change management deps to be constraints

- Looks like if plain deps are not defined as constraints test
  deps will leak into a fatjar build i.e. with sample.
- Change it how its done in spring security where this idea
  was taken.
- Remove use of maven-publish plugin which is not needed.
- Relates #470

spring-shell-management/spring-shell-management.gradle

@@ -1,6 +1,5 @@
 plugins {
 	id 'java-platform'
-	id 'maven-publish'
 }
 
 javaPlatform {
@@ -11,8 +10,10 @@ description = 'Spring Shell BOM'
 
 dependencies {
 	api platform("org.springframework.boot:spring-boot-dependencies:$springBootVersion")
-	api "org.jline:jline:$jlineVersion"
-	api "org.jline:jline-terminal-jna:$jlineVersion"
-	api "org.antlr:ST4:$st4Version"
-	api "com.google.jimfs:jimfs:$jimfsVersion"
+	constraints {
+		api "org.jline:jline:$jlineVersion"
+		api "org.jline:jline-terminal-jna:$jlineVersion"
+		api "org.antlr:ST4:$st4Version"
+		api "com.google.jimfs:jimfs:$jimfsVersion"
+	}
 }