Update postgresql to 42.2.26

[scala-steward]

Updates org.postgresql:postgresql from 42.2.10 to 42.2.26.
Changelog

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

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Adjust future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "org.postgresql", artifactId = "postgresql" } ]

Or, add this to slow down future updates of this dependency:

dependencyOverrides = [{
  pullRequests = { frequency = "@monthly" },
  dependency = { groupId = "org.postgresql", artifactId = "postgresql" }
}]

labels: library-update, early-semver-patch, semver-spec-patch, commit-count:1

[scala-steward]

Superseded by #146.