Update dependency postgres to v3.4.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postgres	3.4.7 → 3.4.8

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Release Notes

porsager/postgres (postgres)

v3.4.8

Compare Source

• Prevent out of bound errors from commit-time failures de64f7a
• fix: use lower max connections in Cloudflare Workers environment 94b7170
• Add support for sslnegotiation=direct - fixes #​1104 7f80980
• omit Sql properties absent from TransactionSql 36a53f6
• Someones engines are getting pedantic - fixes #​1061 3ffc3c4
• Better error if trying to run query during copy 3a43815
• Fix PGAPPNAME env access by prioritizing connection.application_name 32feb25

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