0.103.17

• Add VerifiedPath::issuer_spki() for accessing the encoded SPKI of a verified end entity certificate's issuer.
• Add spki_for_anchor() for accessing the encoded SPKI of a parsed trust anchor.
• Add EndEntityCert::sct_log_timestamps() for accessing an iterator of sct::LogIdAndTimestamp entries present in the certificate.

What's Changed

• Prepare 0.103.17, backport SCT work for upki by @cpu in #553

Full Changelog: v/0.103.16...v/0.103.17