Multipass version 1.16.1

A patch release fixing issues with certificates and external directories, as well as in mounts:

• [multipassd] regenerate gRPC server certificate on root ca mismatch (#4218)
• Certificates inaccessible when MULTIPASS_STORAGE is set (#4246)
• [sshfs-mount] make chown return 0 on Windows (#4288)

See also the v1.16.1 milestone and the full diff: https://github.com/canonical/multipass/compare/v1.16.0...v1.16.1