Remove incidental md5() function use from test

Tomas Vondra <tomas.vondra@postgresql.org>

Commit: 49b82522f13fa5f756687f5609f687877fc970ff
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Date: 2025-03-30T11:22:39Z
Releases: 18.0
Remove incidental md5() function use from test

Replace md5() with sha256() in tests introduced in 14ffaece0fb5, to
allow test to pass in OpenSSL FIPS mode.

Reported-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/3518736.1743307492@sss.pgh.pa.us

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