ICU-22583 BRS74: Version number update for 74.2 #1297

Job	Run time
clang-valgrind-test	10m 26s
clang-valgrind-intltest (utility)	6m 34s
clang-valgrind-intltest (normalize)	6m 12s
clang-valgrind-intltest (collator)	5m 28s
clang-valgrind-intltest (regex)	5m 27s
clang-valgrind-intltest (format)	17m 25s
clang-valgrind-intltest (translit)	6m 0s
clang-valgrind-intltest (rbbi)	7m 41s
clang-valgrind-intltest (rbnf)	6m 10s
clang-valgrind-intltest (rbnfrt)	6m 46s
clang-valgrind-intltest (icuserv)	5m 2s
clang-valgrind-intltest (idna)	5m 6s
clang-valgrind-intltest (convert)	7m 3s
clang-valgrind-intltest (rbnfp)	5m 14s
clang-valgrind-intltest (csdet)	4m 58s
clang-valgrind-intltest (spoof)	5m 1s
clang-valgrind-intltest (bidi)	5m 20s
	1h 55m 53s

Provide feedback