Revert bosk-spring-boot-3 with spring boot plugin.

This interfered with the build process, causing us to stop building the
bosk-spring-boot-3 jar. I think this plugin was meant for building
applications, not libraries.

In any case, our testing requirements are met for now in
HelloServiceEndpointsTest so let's just revert this.

bosk-spring-boot-3/build.gradle

@@ -3,10 +3,6 @@ plugins {
 	id 'bosk.development'
 	id 'bosk.maven-publish'
 	id 'com.github.spotbugs' version '5.1.5'
-
-	// These are needed just for testing
-	id 'org.springframework.boot' version '3.3.2'
-	id 'io.spring.dependency-management' version '1.1.3'
 }
 
 java {
@@ -16,11 +12,10 @@ java {
 
 dependencies {
 	api project(":bosk-jackson")
-	implementation 'org.springframework.boot:spring-boot-starter-web'
-	annotationProcessor 'org.springframework.boot:spring-boot-configuration-processor'
+	implementation 'org.springframework.boot:spring-boot-starter-web:3.3.2'
+	annotationProcessor "org.springframework.boot:spring-boot-configuration-processor:3.3.2"
 	testImplementation project(":bosk-testing")
 	testImplementation project(":lib-testing")
-	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 }
 
 repositories {