ICU-22723 BRS_76_RC: Update version number to 76.1-SNAPSHOT #2837

Job	Run time
clang-valgrind-intltest (utility)	6m 52s
clang-valgrind-intltest (normalize)	6m 48s
clang-valgrind-intltest (collator)	5m 33s
clang-valgrind-test	10m 18s
clang-valgrind-intltest (regex)	5m 12s
clang-valgrind-intltest (format)	16m 21s
clang-valgrind-intltest (translit)	5m 55s
clang-valgrind-intltest (rbbi)	7m 41s
clang-valgrind-intltest (rbnf)	6m 22s
clang-valgrind-intltest (rbnfrt)	6m 35s
clang-valgrind-intltest (icuserv)	5m 35s
clang-valgrind-intltest (idna)	5m 14s
clang-valgrind-intltest (convert)	7m 2s
clang-valgrind-intltest (rbnfp)	4m 45s
clang-valgrind-intltest (csdet)	5m 7s
clang-valgrind-intltest (spoof)	5m 18s
clang-valgrind-intltest (bidi)	5m 37s
	1h 56m 15s

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