chore: Update dependencies

[nabetti1720]

Issue # (if available)

Closed #134
Closed #135

Description of changes

The following crates listed in Cargo.toml have become stable:

• der v0.8.0
• digest v0.11.0

And we've also updated the Cargo.lock dependency.

% cargo update
    Updating crates.io index
     Locking 12 packages to latest compatible versions
    Updating cc v1.2.55 -> v1.2.56
    Updating crypto-bigint v0.7.0-rc.25 -> v0.7.0-rc.27
    Updating crypto-primes v0.7.0-pre.8 -> v0.7.0-pre.9
    Updating der v0.8.0-rc.10 -> v0.8.0
    Updating digest v0.11.0-rc.11 -> v0.11.0
    Updating ghash v0.6.0-rc.5 -> v0.6.0-rc.6
    Updating libc v0.2.180 -> v0.2.182
    Updating pkcs8 v0.11.0-rc.10 -> v0.11.0-rc.11
    Updating poly1305 v0.9.0-rc.5 -> v0.9.0-rc.6
    Updating polyval v0.7.0-rc.7 -> v0.7.0-rc.9
    Updating syn v2.0.114 -> v2.0.115
    Updating zmij v1.0.20 -> v1.0.21