• 459a9db go.mod: update golang.org/x dependencies
• 74e709a ssh: add AlgorithmNegotiationError
• b3790b8 acme: fix TLSALPN01ChallengeCert for IP address identifiers
• 1dc4269 acme: add Pebble integration testing
• 97bf787 blake2b: implement hash.XOF
• 952517d x509roots/fallback: update bundle
• c6fce02 ssh: refuse to parse certificates that use a certificate as signing key
• 0ae49b8 ssh: reject certificate keys used as signature keys for SSH certs
• 3bf9d2a ssh/test: skip KEX test if unsupported by system SSH client
• 9bab967 go.mod: update golang.org/x dependencies
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