ICU-22793 Clang-Tidy: google-readability-casting #2839

Job	Run time
clang-valgrind-test	10m 13s
clang-valgrind-intltest (utility)	6m 48s
clang-valgrind-intltest (normalize)	6m 29s
clang-valgrind-intltest (collator)	5m 17s
clang-valgrind-intltest (regex)	5m 10s
clang-valgrind-intltest (format)	16m 27s
clang-valgrind-intltest (translit)	6m 3s
clang-valgrind-intltest (rbbi)	7m 35s
clang-valgrind-intltest (rbnf)	6m 28s
clang-valgrind-intltest (rbnfrt)	6m 14s
clang-valgrind-intltest (icuserv)	5m 28s
clang-valgrind-intltest (idna)	5m 12s
clang-valgrind-intltest (convert)	6m 43s
clang-valgrind-intltest (rbnfp)	5m 14s
clang-valgrind-intltest (csdet)	5m 15s
clang-valgrind-intltest (spoof)	5m 5s
clang-valgrind-intltest (bidi)	5m 42s
	1h 55m 23s

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