Update dependency org.kohsuke:github-api to v2.0-rc.6 (#15526)

Author: renovate-bot

.jbang/CheckoutPR.java

@@ -20,7 +20,7 @@
 //JAVA 21+
 //RUNTIME_OPTIONS --enable-native-access=ALL-UNNAMED
 
-//DEPS org.kohsuke:github-api:2.0-rc.5
+//DEPS org.kohsuke:github-api:2.0-rc.6
 //DEPS org.eclipse.jgit:org.eclipse.jgit.pgm:7.6.0.202603022253-r
 
 public class CheckoutPR {