chore(deps): update dependency sshpk to v1.16.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
sshpk	resolutions	minor	1.13.2 -> 1.16.1

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Release Notes

joyent/node-sshpk

v1.16.1

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• 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

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• 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

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

v1.15.1

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v1.15.0

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v1.14.2

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v1.14.1

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