Update sbt-git to 2.1.0 (#159)

Author: scala-steward

project/plugins.sbt

@@ -3,5 +3,5 @@ addSbtPlugin("com.github.sbt" % "sbt-pgp"      % "2.1.2")
 addSbtPlugin("org.scalameta"  % "sbt-scalafmt" % "2.5.2")
 addSbtPlugin("org.scalameta"  % "sbt-mdoc"     % "2.6.1")
 addSbtPlugin("com.github.sbt" % "sbt-release"  % "1.4.0")
-addSbtPlugin("com.github.sbt" % "sbt-git"      % "2.0.1")
+addSbtPlugin("com.github.sbt" % "sbt-git"      % "2.1.0")
 addSbtPlugin("com.github.sbt" % "sbt-protobuf" % "0.8.0")