This reverts commit 6d52d6c4.

Incompatible with Go 1.16 (debian stable version).

Update module golang.org/x/crypto to v0.3.0

See merge request !80

Update module golang.org/x/sync to v0.1.0

See merge request !79

Update module github.com/mattn/go-sqlite3 to v1.14.16

See merge request !81

Update module github.com/coreos/go-systemd/v22 to v22.5.0

See merge request !82

Update golang.org/x/sync digest to 7f9b162

See merge request !76

Update opentelemetry-go monorepo to v1.10.0

See merge request !73

Update module github.com/coreos/go-systemd/v22 to v22.4.0

See merge request !74

Update golang.org/x/sync digest to f12130a

See merge request !71

Update golang.org/x/crypto digest to c86fa9a

See merge request !70

Update module github.com/google/go-cmp to v0.5.9

See merge request !72

Use the preferred otel.GetTracerProvider() idiom and create dedicated
Tracer instances as needed, which seems to be best practice.

Restores github.com/duo-labs/webauthn to commit 03696f3, which still
builds with Go 1.15 as shipped in Debian stable. Commits past 41e0a04
require Go 1.18.

Update github.com/duo-labs/webauthn digest to 00c9fb5

See merge request !68

Update module github.com/mattn/go-sqlite3 to v1.14.15

See merge request !69

Should prevent creation of client spans unless there's an incoming
parent span already.

Add sqlutil package

See merge request !66