remove sbt-findbugs which also disappeared and isn't used here anyway

Author: mpollmeier

project/plugins.sbt

@@ -1,6 +1,5 @@
 addSbtPlugin("com.github.sbt"    % "sbt-protobuf"         % "0.8.2")
 addSbtPlugin("org.scalameta"     % "sbt-scalafmt"         % "2.4.6")
-addSbtPlugin("com.github.sbt"    % "sbt-findbugs"         % "2.0.0")
 addSbtPlugin("io.shiftleft"      % "sbt-ci-release-early" % "2.0.48")
 addSbtPlugin("com.github.sbt"    % "sbt-dynver"           % "5.1.0")
 addSbtPlugin("com.github.sbt"    % "sbt-native-packager"  % "1.10.4")