Tests fail with go1.19

[anthonyfok]

Several tests fail with go1.19, but pass with go1.18:

$ go version
go version go1.19 linux/amd64
$ go test ./...
--- FAIL: TestGetKey (2.99s)
    gokey_test.go:161: keys with same invocation options do not match
FAIL
FAIL	github.com/cloudflare/gokey	3.153s
?   	github.com/cloudflare/gokey/cmd/gokey	[no test files]
--- FAIL: TestKnownKey (0.20s)
    keygen_test.go:129: generated RSA 2048 does not match the expected result
--- FAIL: TestStdKey (0.25s)
    keygen_test.go:149: mitigating crypto/internal/randutil.MaybeReadByte...
    keygen_test.go:149: mitigating crypto/internal/randutil.MaybeReadByte...
    keygen_test.go:194: RSA key generation algorithm from stdlib deviates from the one in gokey
FAIL
FAIL	github.com/cloudflare/gokey/rsa	0.454s
FAIL

See the Debian FTBFS (fail-to-build-from-source) bug at https://bugs.debian.org/1017300 where @lnussbaum routinely rebuilds packages with the latest tools and libraries, and in this case, go1.19. It probably has to do with changes made to go1.19 built-in crypto libraries, see https://go.dev/doc/go1.19#minor_library_changes

Many thanks!