0.29.0

This release is reaping the rewards of the new signer API with four(!) new
signing methods: Two cloud based KMSs, post-quantum crypto support and a
"keyless" signing system.

Advance notice to folks using the keys, ecdsa_keys, rsa_keys and
ed25519_keys modules: these modules are headed for deprecation. Please have
a look at the signer API and get in touch if the functionality you need
isn't there (or if more documentation is needed).

Added

• Sigstore as a new experimental signing method (#552)
• SPHINCS+ as a new experimental signing method (#568)
• Azure Key Vault as a new signing method (#588)
• AWS KMS as a new signing method (#609)
• CryptoSigner as a more featureful replacement for SSLibSigner (#604)
• Documentation that focuses on the signer API (#634, #622)

Changed

• SSLibSigner has been deprecated: Please use CryptoSigner instead (#604)
• keys module is not used for signature verification in signer API (#585)
• Various minor fixes, please see git log for details

New Contributors

• @malancas made their first contribution in #588
• @kommendorkapten made their first contribution in #597
• @ianhundere made their first contribution in #609

Full Changelog: v0.28.0...v0.29.0