Fix expectation for CRuby master

Author: eregon

core/time/new_spec.rb

@@ -645,7 +645,7 @@ def obj.to_int; 3; end
 
         -> {
           Time.new("2020-12-25 00:56:17 +23:59:60")
-        }.should raise_error(ArgumentError, /(utc_offset|argument) out of range/)
+        }.should raise_error(ArgumentError, /utc_offset|argument out of range/)
 
         -> {
           Time.new("2020-12-25 00:56:17 +24:00")