Changelog for 1.13.1 (#1844)

I was initially not going to release a new version of pulumi-java, but
there’s a dependency update for a security flag, so we might as well do
it to appease our scanner overlords.

Author: julienp

CHANGELOG.md

@@ -1,6 +1,10 @@
 CHANGELOG
 =========
 
+## 1.13.1
+
+* Update dependencies
+
 ## 1.13.0
 
 ### Improvements