fix: add reentrant guard to Unpacker.feed() (#704) #205

Job	Run time
Build wheels on ubuntu-24.04	4m 15s
Build wheels on windows-latest	11m 27s
Build wheels on macos-latest	2m 43s
Build wheels on ubuntu-24.04-riscv64	33m 54s
Build wheels on windows-11-arm	4m 46s
Build wheels on ubuntu-24.04-arm	4m 20s
Build wheels on macos-15-intel	5m 15s
combine_wheels	5s
upload_pypi	-1s
	1h 6m 44s

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