Document context.runAttempt in @actions/github 6.0.1 (#2054)

Author: joshmgross

packages/github/RELEASES.md

@@ -2,7 +2,8 @@
 
 ### 6.0.1
 
-- Dependency updates [#2043](https://github.com/actions/toolkit/pull/2043/)
+- Dependency updates [#2043](https://github.com/actions/toolkit/pull/2043)
+- Add `context.runAttempt` [#1588](https://github.com/actions/toolkit/pull/1588)
 
 ### 6.0.0 
 - Support the latest Octokit in @actions/github [#1553](https://github.com/actions/toolkit/pull/1553)