downgrade spring version

Author: FrogDevelopper

build.gradle

@@ -21,7 +21,7 @@ dependencies {
     def logbackVersion = '1.2.3'
     def postgresqlVersion = '42.2.18'
     def testcontainersVersion = '1.15.1'
-    def springBootVersion = '2.4.1'
+    def springBootVersion = '2.3.7.RELEASE'
 
     implementation "ch.qos.logback:logback-classic:$logbackVersion"