Upgrade Gradle wrapper and plugins (#561)

Update scalafmt-core to 3.9.6 (#558)

Update hamcrest-core to 3.0 (#537)

Update scala-library, scala-reflect to 2.12.20 (#538)

Update scala-library, scala-reflect to 2.13.16 (#548)

Update sbt-scalafmt to 2.5.4 (#550)

Update scalafmt-core to 3.8.6 (#552)

* Update scalafmt-core to 3.8.6

* Reformat with scalafmt 3.8.6

Executed command: scalafmt --non-interactive

* Add 'Reformat with scalafmt 3.8.6' to .git-blame-ignore-revs

Update sbt to 1.10.11 (#555)

Update scalatest to 3.2.19 (#532)

Update Scala versions to 2.13.13 and 2.12.19 (#527)