Merge pull request #747 from webauthn4j/dependabot/gradle/springBootVersion-2.6.0

Bump springBootVersion from 2.5.7 to 2.6.0

Author: ynojima

build.gradle

@@ -15,7 +15,7 @@
  */
 
 buildscript {
-    def springBootVersion = '2.5.7'
+    def springBootVersion = '2.6.0'
     def sonarqubeVersion = '3.3'
     def asciidoctorGradleVersion = '1.6.1'
     def artifactoryVersion = '4.24.23'