ICU-23246 Update to latest actions and use hashes #4853

Job	Run time
clang-valgrind-test	10m 33s
clang-valgrind-intltest (normalize)	6m 41s
clang-valgrind-intltest (utility)	7m 12s
clang-valgrind-intltest (rbnfrt)	6m 49s
clang-valgrind-intltest (csdet)	4m 56s
clang-valgrind-intltest (rbbi)	9m 28s
clang-valgrind-intltest (regex)	5m 26s
clang-valgrind-intltest (rbnfp)	6m 1s
clang-valgrind-intltest (spoof)	5m 57s
clang-valgrind-intltest (rbnf)	6m 36s
clang-valgrind-intltest (convert)	7m 37s
clang-valgrind-intltest (translit)	6m 13s
clang-valgrind-intltest (icuserv)	5m 53s
clang-valgrind-intltest (bidi)	5m 59s
clang-valgrind-intltest (idna)	5m 46s
clang-valgrind-intltest (collator)	5m 54s
clang-valgrind-intltest (format)	16m 58s
	2h 3m 59s

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