build(deps): bump sshpk from 1.13.1 to 1.16.1

[dependabot[bot]]

Bumps sshpk from 1.13.1 to 1.16.1.

Release notes

Sourced from sshpk's releases.

v1.16.1

• Fixes for #60 (correctly encoding certificates with expiry dates >=2050), #62 (accepting PKCS#8 EC private keys with missing public key parts)

v1.16.0

• Add support for SPKI fingerprints, PuTTY PPK format (public-key only for now), PKCS#8 PBKDF2 encrypted private keys
• Fix for #48

v1.15.2

• New API for accessing x509 extensions in certificates
• Fixes for #52, #50

v1.14.1

• Remove all remaining usage of jodid25519 (abandoned dep)
• Add support for DNSSEC key format
• Add support for Ed25519 keys in PEM format (according to draft-curdle-pkix)
• Fixes for X.509 encoding issues (asn.1 NULLs in RSA certs, cert string type mangling)
• Performance issues parsing long SSH public keys

Commits

• 1aece0d joyent/node-sshpk#60 certs should generate GeneralizedTime values for dates >...
• 684dbe6 joyent/node-sshpk#62 handle pkcs8 ECDSA keys with missing public parts
• 574ff21 joyent/node-sshpk#18 support for PKCS8 encrypted private keys
• f647cf2 joyent/node-sshpk#27 Add support for PuTTY PPK format
• 44aec4a joyent/node-sshpk#59 want support for SPKI fingerprint format
• 385ff11 joyent/node-sshpk#48 wish: add support for x509 certificates in text form
• c7a6c68 joyent/node-sshpk#58 des-ede3-cbc encrypted keys broken
• 2ab4f2a joyent/node-sshpk#56 md5 fingerprints not quite right
• 026ef47 joyent/node-sshpk#53 stop using optional deps to fix webpack
• 53e23fe joyent/node-sshpk#50 Support PKCS#5 AES-256-CBC encrypted private keys
• Additional commits viewable in compare view

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