feat: Replace Spring Dependency Management plugin with Gradle platform + lightweight BOM property overrides

grails-bom/build.gradle

@@ -210,7 +210,7 @@ ext {
                     ExtractedDependencyConstraint extractedConstraint = propertyNameCalculator.calculate(groupId, artifactId, inlineVersion, isBom)
                     if (extractedConstraint?.versionPropertyReference) {
                         // use the property reference instead of the hard coded version so that it can be
-                        // overriden by the spring boot dependency management plugin
+                        // overridden by project properties (gradle.properties or ext['property.name'])
                         dep.version[0].value = extractedConstraint.versionPropertyReference
 
                         // Add an entry in the <properties> node with the actual version number

grails-data-graphql/examples/spring-boot-app/build.gradle

@@ -30,7 +30,6 @@ buildscript {
 apply plugin: 'groovy'
 apply plugin: 'idea'
 apply plugin: 'org.springframework.boot'
-apply plugin: 'io.spring.dependency-management'
 
 dependencies {
 	implementation platform(project(':grails-bom'))

grails-doc/src/en/guide/commandLine/gradleBuild/gradleDependencies.adoc

@@ -60,28 +60,26 @@ dependencies {
 
 Note that version numbers are not present in the majority of the dependencies.
 
-This is thanks to the Spring dependency management plugin which automatically configures `grails-bom` as a Maven BOM via the Grails Gradle Plugin.  This defines the default dependency versions for most commonly used dependencies and plugins.
+This is thanks to Gradle's platform support which automatically imports `grails-bom` as a managed dependency platform via the Grails Gradle Plugin.  This defines the default dependency versions for most commonly used dependencies and plugins.
+
+To override a managed version, set the corresponding property in `gradle.properties` or `build.gradle`:
+[source,groovy]
+----
+// gradle.properties
+slf4j.version=1.7.36
+
+// or build.gradle
+ext['slf4j.version'] = '1.7.36'
+----
 
 For a Grails App, applying `org.apache.grails.gradle.grails-web` will automatically configure the `grails-bom`.  No other steps required.
 
-For Plugins and Projects which do not use `org.apache.grails.gradle.grails-web`, you can apply the `grails-bom` in one of the following two ways.
+For Plugins and Projects which do not use `org.apache.grails.gradle.grails-web`, you can apply the `grails-bom` using Gradle Platforms:
 
-build.gradle, using Gradle Platforms:
 [source,groovy]
 ----
 dependencies {
     implementation platform("org.apache.grails:grails-bom:{GrailsVersion}")
     //...
 }
 ----
-
-build.gradle, using Spring dependency management plugin:
-[source,groovy]
-----
-dependencyManagement {
-    imports {
-        mavenBom 'org.apache.grails:grails-bom:{GrailsVersion}'
-    }
-    applyMavenExclusions false
-}
-----

grails-gradle/plugins/build.gradle

@@ -55,7 +55,6 @@ dependencies {
     implementation "${gradleBomDependencies['grails-publish-plugin']}"
     implementation 'org.springframework.boot:spring-boot-gradle-plugin'
     implementation 'org.springframework.boot:spring-boot-loader-tools'
-    implementation 'io.spring.gradle:dependency-management-plugin'
 
     // Testing - Gradle TestKit is auto-added by java-gradle-plugin
     testImplementation('org.spockframework:spock-core') { transitive = false }