Remove Deprecated OpenSAML 3 Support

Closes gh-10556

saml2/saml2-service-provider/spring-security-saml2-service-provider.gradle

@@ -1,44 +1,4 @@
 apply plugin: 'io.spring.convention.spring-module'
-apply plugin: 'nebula.facet'
-
-facets {
-	opensaml3Main {
-		parentSourceSet = 'main'
-	}
-	opensaml4Main {
-		parentSourceSet = 'main'
-	}
-	opensaml3Test {
-		parentSourceSet = 'opensaml3Main'
-	}
-	opensaml4Test {
-		parentSourceSet = 'opensaml4Main'
-	}
-}
-
-sourceSets {
-	opensaml3Test {
-		compileClasspath += sourceSets.test.output
-		runtimeClasspath += sourceSets.test.output
-	}
-	opensaml4Test {
-		compileClasspath += sourceSets.test.output
-		runtimeClasspath += sourceSets.test.output
-	}
-}
-
-configurations {
-	opensaml3TestImplementation.extendsFrom testImplementation
-	opensaml4TestImplementation.extendsFrom testImplementation
-	opensaml4MainImplementation {
-		canBeConsumed = true
-	}
-}
-
-compileOpensaml4MainJava {
-	sourceCompatibility = JavaVersion.VERSION_17
-	targetCompatibility = JavaVersion.VERSION_17
-}
 
 dependencies {
 	management platform(project(":spring-security-dependencies"))
@@ -50,13 +10,6 @@ dependencies {
 	api ("org.opensaml:opensaml-saml-impl")  {
 		exclude group: 'commons-logging', module: 'commons-logging'
 	}
-	opensaml4MainImplementation "org.opensaml:opensaml-core:4.1.0"
-	opensaml4MainImplementation ("org.opensaml:opensaml-saml-api:4.1.0") {
-		exclude group: 'commons-logging', module: 'commons-logging'
-	}
-	opensaml4MainImplementation ("org.opensaml:opensaml-saml-impl:4.1.0") {
-		exclude group: 'commons-logging', module: 'commons-logging'
-	}
 
 	provided 'jakarta.servlet:jakarta.servlet-api'
 
@@ -73,35 +26,3 @@ dependencies {
 	testImplementation "org.mockito:mockito-junit-jupiter"
 	testImplementation "org.springframework:spring-test"
 }
-
-project.tasks.matching { t -> t.name == "jar"}.configureEach {
-	duplicatesStrategy = DuplicatesStrategy.EXCLUDE
-	from {
-		compileOpensaml3MainJava
-	}
-	from {
-		compileOpensaml4MainJava
-	}
-}
-
-project.tasks.matching { t -> t.name == "sourcesJar"}.configureEach {
-	from {
-		sourceSets.opensaml3Main.allSource
-	}
-	from {
-		sourceSets.opensaml4Main.allSource
-	}
-}
-
-
-javadoc {
-	source += sourceSets.opensaml3Main.allJava + sourceSets.opensaml4Main.allJava
-}
-
-opensaml3Test {
-	useJUnitPlatform()
-}
-
-opensaml4Test {
-	useJUnitPlatform()
-}