Update GAE 1.9.63

Fixes: gh-5277

gradle.properties

@@ -1,3 +1,3 @@
-gaeVersion=1.9.62
+gaeVersion=1.9.63
 springBootVersion=2.0.0.RELEASE
 version=5.1.0.BUILD-SNAPSHOT

gradle/dependency-management.gradle

@@ -45,7 +45,7 @@ dependencyManagement {
 		dependency 'com.fasterxml.jackson.core:jackson-databind:2.9.5'
 		dependency 'com.fasterxml:classmate:1.3.4'
 		dependency 'com.github.stephenc.jcip:jcip-annotations:1.0-1'
-		dependency 'com.google.appengine:appengine-api-1.0-sdk:1.9.62'
+		dependency 'com.google.appengine:appengine-api-1.0-sdk:1.9.63'
 		dependency 'com.google.appengine:appengine-api-labs:1.9.63'
 		dependency 'com.google.appengine:appengine-api-stubs:1.9.63'
 		dependency 'com.google.appengine:appengine-testing:1.9.63'