Upgrade PyApp to 0.21.1 #3

Job	Run time
Build wheel and source distribution	15s
Publish to PyPI	0s
aarch64-unknown-linux-gnu (ubuntu-22.04)	1m 59s
x86_64-unknown-linux-gnu (ubuntu-22.04)	2m 3s
x86_64-unknown-linux-musl (ubuntu-22.04)	2m 9s
powerpc64le-unknown-linux-gnu (ubuntu-22.04)	1m 59s
x86_64-pc-windows-msvc (windows-2022)	3m 51s
i686-pc-windows-msvc (windows-2022)	4m 51s
aarch64-apple-darwin (macos-12)	2m 7s
x86_64-apple-darwin (macos-12)	2m 41s
Build release distributions	0s
Build Windows installers	1m 4s
Build macOS installer and sign/notarize artifacts	15s
Build development distributions / Ensure Hatch is installable	3s
Build development distributions / Distribution x86_64-unknown-linux-gnu	55s
Build development distributions / Distribution x86_64-pc-windows-msvc	40s
Build development distributions / Distribution aarch64-unknown-linux-gnu	2m 20s
Build development distributions / Distribution aarch64-apple-darwin	30s
Build development distributions / Distribution x86_64-apple-darwin	35s
Publish distributions	0s
	28m 17s

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