Update github4s to 0.28.3

[scala-steward]

Updates com.47deg:github4s from 0.28.2 to 0.28.3.
GitHub Release Notes - Changelog - Version Diff

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

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Ignore future updates

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

updates.ignore = [ { groupId = "com.47deg", artifactId = "github4s" } ]

labels: library-update, semver-patch

[coveralls]

Coverage remained the same at 73.775% when pulling 5af99bc on scala-steward:update/github4s-0.28.3 into cdc1c3b on d10xa:master.