gh-125245: Fix ZoneInfo data race in free threading build #156

Job	Run time
Interpreter (Debug)	6m 59s
Free-Threaded (Debug)	10m 26s
i686-pc-windows-msvc/msvc (Debug)	17m 45s
i686-pc-windows-msvc/msvc (Release)	21m 1s
x86_64-pc-windows-msvc/msvc (Debug)	18m 55s
x86_64-pc-windows-msvc/msvc (Release)	16m 31s
aarch64-pc-windows-msvc/msvc (Debug)	4m 31s
aarch64-pc-windows-msvc/msvc (Release)	6m 9s
x86_64-apple-darwin/clang (Debug)	12m 30s
x86_64-apple-darwin/clang (Release)	20m 51s
aarch64-apple-darwin/clang (Debug)	8m 48s
aarch64-apple-darwin/clang (Release)	13m 8s
x86_64-unknown-linux-gnu/gcc (Debug)	7m 30s
x86_64-unknown-linux-gnu/gcc (Release)	17m 28s
x86_64-unknown-linux-gnu/clang (Debug)	7m 45s
x86_64-unknown-linux-gnu/clang (Release)	13m 51s
aarch64-unknown-linux-gnu/gcc (Debug)	1h 17m 16s
aarch64-unknown-linux-gnu/gcc (Release)	36m 16s
aarch64-unknown-linux-gnu/clang (Debug)	1h 6m 26s
aarch64-unknown-linux-gnu/clang (Release)	1h 30m 13s
	7h 54m 19s

Provide feedback