Update sbt-giter8 to 0.16.0

[scala-steward]

Updates org.foundweekends.giter8:sbt-giter8 from 0.13.1 to 0.16.0. GitHub Release Notes - Version Diff

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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.foundweekends.giter8", artifactId = "sbt-giter8" } ] ``` Or, add this to slow down future updates of this dependency: ``` dependencyOverrides = [{ pullRequests = { frequency = "@monthly" }, dependency = { groupId = "org.foundweekends.giter8", artifactId = "sbt-giter8" } }] ```

labels: sbt-plugin-update, early-semver-major, semver-spec-minor, commit-count:1

[scala-steward]

Superseded by #103.