gh-141510: Complete What's New in Python 3.15 for frozendict (#145537) #2216

Job	Run time
x86_64-unknown-linux-gnu/gcc-free-threading	8m 44s
x86_64-apple-darwin/clang	15m 48s
aarch64-unknown-linux-gnu/gcc	7m 11s
x86_64-unknown-linux-gnu/gcc	10m 1s
x86_64-pc-windows-msvc/msvc	10m 47s
aarch64-apple-darwin/clang	10m 21s
x86_64-pc-windows-msvc/msvc-free-threading	6m 18s
	1h 9m 10s

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