Merge pull request rails#54802 from yahonda/diag54794

Address MultibyteCharsExtrasTest#test_should_compute_grapheme_lengthfailure with Ruby 3.5.0dev

Author: yahonda

activesupport/test/multibyte_chars_test.rb

@@ -599,7 +599,7 @@ def test_should_compute_grapheme_length
       ["", 0],
       ["abc", 3],
       ["こにちわ", 4],
-      [[0x0924, 0x094D, 0x0930].pack("U*"), 2],
+      [[0x0924, 0x094D, 0x0930].pack("U*"), RbConfig::CONFIG["UNICODE_VERSION"] >= "15.1.0" ? 1 : 2],
       # GB3
       [%w(cr lf), 1],
       # GB4