Tests

Bump nix to 0.29 (#465) #1711

Job	Run time
quick-test	4m 47s
tests-from-tarball (ubuntu-latest)	2m 30s
test (macOS-latest, stable)	4m 53s
pr-mutants	0s
test (macOS-latest, nightly)	9m 49s
cargo-mutants (0, cargo)	12m 51s
test (macOS-latest, 1.78)	5m 15s
cargo-mutants (1, cargo)	7m 43s
test (ubuntu-latest, stable)	4m 49s
cargo-mutants (2, cargo)	15m 50s
test (ubuntu-latest, nightly)	8m 32s
cargo-mutants (3, cargo)	12m 27s
cargo-mutants (4, cargo)	8m 5s
test (ubuntu-latest, 1.78)	5m 9s
test (windows-latest, stable)	10m 10s
cargo-mutants (5, cargo)	9m 23s
test (windows-latest, nightly)	16m 32s
cargo-mutants (6, cargo)	10m 43s
test (windows-latest, 1.78)	7m 35s
cargo-mutants (7, cargo)	7m 45s
cargo-mutants (8, cargo)	8m 10s
cargo-mutants (9, cargo)	12m 41s
overall-result	1s
	3h 5m 40s

Provide feedback