chore: update Gradle to 6.5, Spring Boot to 2.3.1 and other dependencies#422

oliemansm merged 2 commits intographql-java-kickstart:mastergraphql-java-kickstart/graphql-spring-boot:masterfrom

BlasiusSecundus:feature/gradle-and-dependency-updateBlasiusSecundus/graphql-spring-boot:feature/gradle-and-dependency-updateCopy head branch name to clipboard