Tests

Bump MSRV to 1.78 #1705

Job	Run time
quick-test	2m 51s
tests-from-tarball (ubuntu-latest)	2m 25s
pr-mutants (cargo)	19s
test (macOS-latest, stable)	6m 45s
cargo-mutants (0, cargo)	12m 54s
pr-mutants (nextest)	24s
test (macOS-latest, nightly)	11m 15s
cargo-mutants (1, cargo)	7m 39s
test (macOS-latest, 1.78)	8m 6s
cargo-mutants (2, cargo)	16m 16s
test (ubuntu-latest, stable)	7m 1s
cargo-mutants (3, cargo)	15m 59s
test (ubuntu-latest, nightly)	8m 46s
cargo-mutants (4, cargo)	8m 16s
test (ubuntu-latest, 1.78)	7m 0s
cargo-mutants (5, cargo)	9m 14s
test (windows-latest, stable)	11m 17s
cargo-mutants (6, cargo)	10m 52s
test (windows-latest, nightly)	16m 1s
cargo-mutants (7, cargo)	8m 46s
test (windows-latest, 1.78)	11m 36s
cargo-mutants (8, cargo)	8m 12s
cargo-mutants (9, cargo)	12m 36s
overall-result	1s
	3h 24m 31s

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