GUACAMOLE-773: Update to more recent version of "ssri" as suggested by npm audit.
GUACAMOLE-773: Update to more recent version of "ssri" as suggested by npm audit.

glyptodon/guacamole-client,glyptodon/guacamole-client,glyptodon/guacamole-client,glyptodon/guacamole-client,glyptodon/guacamole-client