fix arenastring patch for 27.5 #372

Job	Run time
aarch64	46s
arenastring-gcc-stdlibc++-default	20m 20s
basic-gcc-c++20-stdlibc++-asan	39s
arenastring-gcc-stdlibc++-half	20m 38s
basic-gcc-c++20-stdlibc++-tsan	54s
arenastring-gcc-stdlibc++-full	21m 17s
basic-gcc-c++14-stdlibc++-asan	47s
arenastring-clang-stdlibc++-default	11m 52s
basic-clang-c++20-stdlibc++-asan	39s
arenastring-clang-libc++-default	12m 0s
basic-clang-c++20-stdlibc++-tsan	39s
cmake	46s
basic-clang-c++20-libc++-asan	55s
coverage	42s
basic-clang-c++20-libc++-tsan	35s
workspace	35s
basic-clang-c++14-stdlibc++-asan	37s
basic-clang-c++14-libc++-asan	49s
	1h 35m 30s

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