pgsql: Fix regression in TLS session ticket disabling

Fix regression in TLS session ticket disabling

Commit 274bbced disabled session tickets for TLSv1.3 on top of the
already disabled TLSv1.2 session tickets, but accidentally caused
a regression where TLSv1.2 session tickets were incorrectly sent.
Fix by unconditionally disabling TLSv1.2 session tickets and only
disable TLSv1.3 tickets when the right version of OpenSSL is used.

Backpatch to all supported branches.

Reported-by: Cameron Vogt <cvogt@automaticcontrols.net>
Reported-by: Fire Emerald <fire.github@gmail.com>
Reviewed-by: Jacob Champion <jacob.champion@enterprisedb.com>
Discussion: https://postgr.es/m/DM6PR16MB3145CF62857226F350C710D1AB852@DM6PR16MB3145.namprd16.prod.outlook.com
Backpatch-through: v12

Branch
------
REL_12_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/cd98a142cb37fbef82b94a88cd72ed936854991c

Modified Files
--------------
src/backend/libpq/be-secure-openssl.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)