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

Provides SQL-related helpers, mostly targeted to a simple sqlite
embedded database.

Update golang.org/x/crypto digest to 630584e

See merge request !61

Update golang.org/x/sync commit hash to 886fb93

See merge request !62

Update module github.com/go-ldap/ldap/v3 to v3.4.4

See merge request !63

Update golang.org/x/sync commit hash to 0de741c

See merge request !60

Update golang.org/x/crypto commit hash to 793ad66

See merge request !56