Update rbenv version to match LS (#338) (#340)

This commit updates the jruby version to match the corresponding branch
in LS.

(cherry picked from commit f233138)

Co-authored-by: Cas Donoghue <[email protected]>

Author: mergify[bot]

.ruby-version

@@ -1 +1 @@
-jruby-9.4.8.0
+jruby-9.4.13.0