Remove Spring IO Tests

Spring IO Cairo is the last build and it does not use Spring 5.1
dependencies.

Jenkinsfile

@@ -39,21 +39,6 @@ try {
 			}
 		}
 	},
-	springio: {
-		stage('Spring IO') {
-			node {
-				checkout scm
-				try {
-					sh "./gradlew clean springIoCheck -PplatformVersion=Cairo-BUILD-SNAPSHOT -PexcludeProjects='**/samples/**' --refresh-dependencies --no-daemon --stacktrace"
-				} catch(Exception e) {
-					currentBuild.result = 'FAILED: springio'
-					throw e
-				} finally {
-					junit '**/build/spring-io*-results/*.xml'
-				}
-			}
-		}
-	},
 	snapshots: {
 		stage('Snapshot Tests') {
 			node {