Improve build: replace usage of setup-gpg with sbt-ci-release plugin #109
Description
According to https://github.com/olafurpg/setup-gpg/pull/7/files, setup-gpg can be replaced with https://github.com/sbt/sbt-ci-release.
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According to https://github.com/olafurpg/setup-gpg/pull/7/files, setup-gpg can be replaced with https://github.com/sbt/sbt-ci-release.