Update sbt-typelevel-mergify to 0.7.7

Author: scala-steward

project/plugins.sbt

@@ -11,6 +11,6 @@ addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.4.7")
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.3.2")
 addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.6.2")
 addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.3.0")
-addSbtPlugin("org.typelevel" % "sbt-typelevel-mergify" % "0.7.6")
+addSbtPlugin("org.typelevel" % "sbt-typelevel-mergify" % "0.7.7")
 
 ThisBuild / evictionErrorLevel := Level.Info