support GSS encryption

[github-actions]

psql-wire currently does not support GSS encrypted connections. The GSS
authentication API is supported inside the PostgreSQL wire protocol and
API's should be made available to support these type of connections.
https://www.postgresql.org/docs/current/gssapi-auth.html
https://www.postgresql.org/docs/current/protocol-flow.html#id-1.10.6.7.13

Line: 27

psql-wire//handshake.go

Lines 24 to 34 in 2ae2aca

	return conn, version, reader, nil
	}
	// TODO: support GSS encryption
	//
	// `psql-wire` currently does not support GSS encrypted connections. The GSS
	// authentication API is supported inside the PostgreSQL wire protocol and
	// API's should be made available to support these type of connections.
	// https://www.postgresql.org/docs/current/gssapi-auth.html
	// https://www.postgresql.org/docs/current/protocol-flow.html#id-1.10.6.7.13