Werk #16603: mk_postgres: Ensure coherent string encoding

Component	Checks & agents
Title	mk_postgres: Ensure coherent string encoding
Date	Mar 27, 2024
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.4.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.3.0b4 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p26 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

Postgres.cfg was always read as unicode decoded. This ensures that the read text is correctly converted to byte string format.

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