Bump makeseeds version filter

Summary: Bump the seed version filter to include 0.29.x and exclude 0.27.x.

Test Plan: There is no easy way to test the behavior without a full seeder infra, but this is trivial enough.

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D15852