Remove expired ports:

2020-07-24 databases/postgresql94-client: PostgreSQL-9.4 has reached end-of-life
2020-07-24 databases/postgresql94-contrib: PostgreSQL-9.4 has reached end-of-life
2020-07-24 databases/postgresql94-docs: PostgreSQL-9.4 has reached end-of-life
2020-07-24 databases/postgresql94-pgtcl: PostgreSQL-9.4 has reached end-of-life
2020-07-24 databases/postgresql94-plpython: PostgreSQL-9.4 has reached end-of-life
2020-07-24 databases/postgresql94-server: PostgreSQL-9.4 has reached end-of-life
2020-07-24 databases/postgresql94-pltcl: PostgreSQL-9.4 has reached end-of-life
2020-07-24 databases/postgresql94-plperl: PostgreSQL-9.4 has reached end-of-life