pg_upgrade; change major version comparisons to use <=, not <

Bruce Momjian <bruce@momjian.us>

Commit: f09e2a8c6307058aa767924516bb057cc9cedef8
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-10-06T16:12:09Z
Releases: 10.15
pg_upgrade;  change major version comparisons to use <=, not <

This makes checking for older major versions more consistent.

Backpatch-through: 9.5

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