chore: version to 0.39.4 #469

Job	Run time
Cargo Machete	1m 0s
determine changes	5s
pre-commit	43s
build binary \| linux x86_64	2m 51s
build binary \| windows aarch64	4m 0s
build binary \| macos x86_64	0s
build binary \| macos aarch64	1s
build binary \| windows x86_64	3m 8s
cargo test \| ubuntu	4m 32s
cargo test \| macos aarch64	1s
cargo test \| macos x86_64	0s
cargo test \| windows	3m 9s
cargo rustdoc \| ubuntu	1m 6s
cargo fmt \| ubuntu	14s
cargo clippy \| ubuntu	47s
Pytest \| linux x86_64	1m 10s
Integration tests \| linux x86_64	0s
Downstream tests \| linux x86_64	0s
Wheel Tests \| linux x86_64 / Test Installation of Common Wheels \| linux-x86_64	1m 56s
Integration tests \| macos aarch64	1s
Wheel Tests \| macos aarch64	1s
Downstream tests \| macos aarch64	1s
Pytest \| macos aarch64	1s
Downstream tests \| windows x86_64	1s
Integration tests \| windows x86_64	1s
Pytest \| windows x86_64	1s
Wheel Tests \| windows x86_64	1s
	24m 51s

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