Bump GitHub-API to 1.53 (released)

EMail patch to GitHub-API have been merged to 1.52-SNAPSHOT
and released in 1.53.

Change-Id: I34c38a61805950163b2777d562ef15e0dd7447d9

github-oauth/pom.xml

diff --git a/github-oauth/pom.xml b/github-oauth/pom.xml
index b089af9..ace8c1a 100644
--- a/github-oauth/pom.xml
+++ b/github-oauth/pom.xml
@@ -107,7 +107,7 @@
     <dependency>
       <groupId>org.kohsuke</groupId>
       <artifactId>github-api</artifactId>
-      <version>1.52-SNAPSHOT</version>
+      <version>1.53</version>
     </dependency>
     <dependency>
       <groupId>org.apache.httpcomponents</groupId>