Update dependency pg to v1.5.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pg (changelog)	'1.5.3' -> '1.5.4'

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Release Notes

ged/ruby-pg (pg)

v1.5.4

Compare Source

• Fix compiling the pg extension with MSVC 2022. #​535
• Set PG::Connection's encoding even if setting client_encoding on connection startup fails. #​541
• Don't set the server's client_encoding if it's unnecessary. #​542
  This is important for connection proxies, who disallow configuration settings.
• Update Windows fat binary gem to OpenSSL-3.1.2 and PostgreSQL-15.4.

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