Update to Spring Boot 2.6.7

Closes gh-719

docs/src/docs/asciidoc/examples/spring-authorization-server-docs-examples.gradle

@@ -11,7 +11,7 @@ repositories {
 }
 
 dependencies {
-	implementation platform("org.springframework.boot:spring-boot-dependencies:2.5.12")
+	implementation platform("org.springframework.boot:spring-boot-dependencies:2.6.7")
 	implementation "org.springframework.boot:spring-boot-starter-web"
 	implementation "org.springframework.boot:spring-boot-starter-thymeleaf"
 	implementation "org.springframework.boot:spring-boot-starter-security"

samples/custom-consent-authorizationserver/samples-custom-consent-authorizationserver.gradle

@@ -1,5 +1,5 @@
 plugins {
-	id "org.springframework.boot" version "2.5.12"
+	id "org.springframework.boot" version "2.6.7"
 	id "io.spring.dependency-management" version "1.0.11.RELEASE"
 	id "java"
 }

samples/default-authorizationserver/samples-default-authorizationserver.gradle

@@ -1,5 +1,5 @@
 plugins {
-	id "org.springframework.boot" version "2.5.12"
+	id "org.springframework.boot" version "2.6.7"
 	id "io.spring.dependency-management" version "1.0.11.RELEASE"
 	id "java"
 }

samples/federated-identity-authorizationserver/samples-federated-identity-authorizationserver.gradle

@@ -1,5 +1,5 @@
 plugins {
-	id "org.springframework.boot" version "2.5.12"
+	id "org.springframework.boot" version "2.6.7"
 	id "io.spring.dependency-management" version "1.0.11.RELEASE"
 	id "java"
 }

samples/messages-client/samples-messages-client.gradle

@@ -1,5 +1,5 @@
 plugins {
-	id "org.springframework.boot" version "2.5.12"
+	id "org.springframework.boot" version "2.6.7"
 	id "io.spring.dependency-management" version "1.0.11.RELEASE"
 	id "java"
 }

samples/messages-resource/samples-messages-resource.gradle

@@ -1,5 +1,5 @@
 plugins {
-	id "org.springframework.boot" version "2.5.12"
+	id "org.springframework.boot" version "2.6.7"
 	id "io.spring.dependency-management" version "1.0.11.RELEASE"
 	id "java"
 }