pgsql: Increase SCRAM salt length

Increase SCRAM salt length

The original value 12 was set based on RFC 5802 for SCRAM-SHA-1, but RFC
7677 for SCRAM-SHA-256 uses 16, so use that. (This does not affect the
validity of already stored verifiers.)

Discussion: /messages/by-id/12cc9297-7e05-932f-d863-765e5626ead4@2ndquadrant.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/fe7774144d5c3f3a2941a2ca51e61352e4005991

Modified Files
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src/include/common/scram-common.h | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)

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