Fix unreleased note in Ruby changelog (#10713)

ShockwaveNN · web-flow · commit 49ea73c758e2 · 2022-05-30T00:55:08.000+02:00
This gem been released several days ago

[skip ci]
diff --git a/rb/CHANGES b/rb/CHANGES
@@ -1,4 +1,4 @@
-4.2.0 (unreleased)
+4.2.0 (2022-05-27)
 =========================
 
 BiDi:
