Update munit, munit-scalacheck to 1.0.0-M8 (#506)

Co-authored-by: typelevel-steward[bot] <106827141+typelevel-steward[bot]@users.noreply.github.com>
Co-authored-by: P. Oscar Boykin <johnynek@users.noreply.github.com>

project/Dependencies.scala

@@ -4,8 +4,8 @@ import org.portablescala.sbtplatformdeps.PlatformDepsPlugin.autoImport._
 object Dependencies {
   lazy val cats = Def.setting("org.typelevel" %%% "cats-core" % "2.9.0")
   lazy val cats211 = Def.setting("org.typelevel" %%% "cats-core" % "2.0.0")
-  lazy val munit = Def.setting("org.scalameta" %%% "munit" % "1.0.0-M6")
-  lazy val munitScalacheck = Def.setting("org.scalameta" %%% "munit-scalacheck" % "1.0.0-M6")
+  lazy val munit = Def.setting("org.scalameta" %%% "munit" % "1.0.0-M8")
+  lazy val munitScalacheck = Def.setting("org.scalameta" %%% "munit-scalacheck" % "1.0.0-M8")
   lazy val fastParse = "com.lihaoyi" %% "fastparse" % "2.3.3"
   lazy val parsley = "org.http4s" %% "parsley" % "1.5.0-M3"
   lazy val jawnAst = Def.setting("org.typelevel" %% "jawn-ast" % "1.4.0")