Migrate some sequences to use bigints

Migrate some sequences to use bigints

These primary keys were converted to bigints in migrations, but the
sequences were left unmentioned. If the original migrations are run on
postgresql 10.0+, then this leads to a mismatch in column types vs sequence
types. This migration fixes these mismatches.

If the original migrations were run on postgresql < 10, all sequences were
bigints anyway, and this migration is a no-op.

If the sequence is a bigint, then postgresql doesn't output that fact in the
statement dump.

Refs #4298