ICU-22482 Hash-pin GitHub Actions, keep them updated with Dependabot #1897

Job	Run time
clang-valgrind-test	9m 25s
clang-valgrind-intltest (utility)	6m 22s
clang-valgrind-intltest (normalize)	6m 24s
clang-valgrind-intltest (collator)	4m 52s
clang-valgrind-intltest (regex)	4m 49s
clang-valgrind-intltest (format)	16m 6s
clang-valgrind-intltest (translit)	5m 34s
clang-valgrind-intltest (rbbi)	6m 47s
clang-valgrind-intltest (rbnf)	5m 55s
clang-valgrind-intltest (rbnfrt)	5m 48s
clang-valgrind-intltest (icuserv)	4m 36s
clang-valgrind-intltest (idna)	4m 49s
clang-valgrind-intltest (convert)	6m 19s
clang-valgrind-intltest (rbnfp)	4m 41s
clang-valgrind-intltest (csdet)	4m 47s
clang-valgrind-intltest (spoof)	4m 58s
clang-valgrind-intltest (bidi)	4m 57s
	1h 47m 9s

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