ICU-22325 BRS74RC: Update version number to 74.1 #925

Job	Run time
clang-valgrind-test	12m 56s
clang-valgrind-intltest (utility)	8m 39s
clang-valgrind-intltest (normalize)	7m 31s
clang-valgrind-intltest (collator)	9m 6s
clang-valgrind-intltest (regex)	6m 10s
clang-valgrind-intltest (format)	23m 47s
clang-valgrind-intltest (translit)	7m 41s
clang-valgrind-intltest (rbbi)	11m 12s
clang-valgrind-intltest (rbnf)	7m 45s
clang-valgrind-intltest (rbnfrt)	7m 56s
clang-valgrind-intltest (icuserv)	6m 27s
clang-valgrind-intltest (idna)	6m 10s
clang-valgrind-intltest (convert)	10m 20s
clang-valgrind-intltest (rbnfp)	6m 40s
clang-valgrind-intltest (csdet)	5m 48s
clang-valgrind-intltest (spoof)	8m 57s
clang-valgrind-intltest (bidi)	6m 36s
	2h 33m 41s

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