Update dependency org.springframework.boot:spring-boot-starter-log4j2 to v2.6.3

Author: mend-for-github-com[bot]

build.gradle

@@ -16,7 +16,7 @@ dependencies {
 	implementation('org.springframework.boot:spring-boot-starter-web') {
 		exclude group: 'org.springframework.boot', module: 'spring-boot-starter-logging'
 	}
-	implementation 'org.springframework.boot:spring-boot-starter-log4j2:2.6.1'
+	implementation 'org.springframework.boot:spring-boot-starter-log4j2:2.6.3'
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 }