Configure Gradle build to use the local Spring Build Conventions Gradle Plugins.

build.gradle

@@ -1,11 +1,13 @@
 buildscript {
-  dependencies {
-    classpath 'io.spring.gradle:spring-build-conventions:0.0.38'
-    classpath "org.springframework.boot:spring-boot-gradle-plugin:$springBootVersion"
+  ext {
+    snapshotBuild = version.endsWith('SNAPSHOT')
+    releaseBuild = version.endsWith('RELEASE')
+    milestoneBuild = !(releaseBuild || snapshotBuild)
   }
   repositories {
     mavenCentral()
     gradlePluginPortal()
+    maven { url 'https://repo.spring.io/plugins-release' }
     maven {
       url 'https://repo.spring.io/plugins-snapshot'
       if (project.hasProperty('artifactoryUsername')) {
@@ -16,6 +18,9 @@ buildscript {
       }
     }
   }
+  dependencies {
+    classpath "org.springframework.boot:spring-boot-gradle-plugin:$springBootVersion"
+  }
 }
 
 apply plugin: 'io.spring.convention.root'
@@ -53,10 +58,6 @@ description = 'Spring Test Framework for Apache Geode and VMware Tanzu GemFire u
 ext['spring-framework.version'] = "$springVersion"
 ext['spring-data-bom.version'] = "$springDataBomVersion"
 
-ext.releaseBuild = version.endsWith('RELEASE')
-ext.snapshotBuild = version.endsWith('SNAPSHOT')
-ext.milestoneBuild = !(releaseBuild || snapshotBuild)
-
 ext.MAVEN_POM_EDITOR_GRADLE = "$rootDir/gradle/maven-pom-editor.gradle"
 
 nohttp {