pgsql: Refuse upgrades from pre-9.0 clusters

Refuse upgrades from pre-9.0 clusters

Commit 695b4a113ab added a dependency on retrieving oldestxid from
pg_control, which only exists in 9.0 and onwards, but the check for
8.4 as the oldest version was retained. Since there has been few if
any complaints of 8.4 upgrades not working, fix by setting 9.0 as
the oldest version supported rather than resurrecting 8.4 support.

Backpatch to all supported versions.

Reviewed-by: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Discussion: https://postgr.es/m/1973418.1657040382@sss.pgh.pa.us
Backpatch-through: v12

Branch
------
REL_14_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/ccf3408cff539d21256f14a350dd156c8bee05ef

Modified Files
--------------
doc/src/sgml/ref/pgupgrade.sgml | 2 +-
src/bin/pg_upgrade/check.c | 9 +++++++--
2 files changed, 8 insertions(+), 3 deletions(-)