ICU-22563 Limit the size for calendar fuzzer #1162

Job	Run time
clang-valgrind-test	16m 1s
clang-valgrind-intltest (utility)	8m 55s
clang-valgrind-intltest (normalize)	7m 34s
clang-valgrind-intltest (collator)	8m 5s
clang-valgrind-intltest (regex)	7m 25s
clang-valgrind-intltest (format)	27m 24s
clang-valgrind-intltest (translit)	9m 59s
clang-valgrind-intltest (rbbi)	10m 31s
clang-valgrind-intltest (rbnf)	9m 16s
clang-valgrind-intltest (rbnfrt)	8m 0s
clang-valgrind-intltest (icuserv)	6m 28s
clang-valgrind-intltest (idna)	6m 10s
clang-valgrind-intltest (convert)	8m 33s
clang-valgrind-intltest (rbnfp)	6m 11s
clang-valgrind-intltest (csdet)	6m 11s
clang-valgrind-intltest (spoof)	8m 41s
clang-valgrind-intltest (bidi)	6m 49s
	2h 42m 13s

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