Fix various warnings in code

Author: kpbochenek

src/test/scala/com/typesafe/scalalogging/LoggerSpec.scala

@@ -595,7 +595,7 @@ class LoggerSpec extends WordSpec with Matchers with MockitoSugar with Varargs {
       val msg = "msg"
       val cause = new RuntimeException("cause")
       val arg1 = "arg1"
-      val arg2 = new Integer(1)
+      val arg2 = Integer.valueOf(1)
       val arg3 = "arg3"
       val arg4 = 4
       val arg4ref = arg4.asInstanceOf[AnyRef]

src/test/scala/com/typesafe/scalalogging/LoggerTakingImplicitSpec.scala

@@ -382,7 +382,7 @@ class LoggerTakingImplicitSpec extends WordSpec with Matchers with MockitoSugar
       val msg = "msg"
       val cause = new RuntimeException("cause")
       val arg1 = "arg1"
-      val arg2 = new Integer(1)
+      val arg2 = Integer.valueOf(1)
       val arg3 = "arg3"
       val logMsg = "corrId - msg"
       val underlying = mock[org.slf4j.Logger]

src/test/scala/com/typesafe/scalalogging/LoggerWithMarkerSpec.scala

@@ -387,7 +387,7 @@ class LoggerWithMarkerSpec extends WordSpec with Matchers with MockitoSugar with
       val msg = "msg"
       val cause = new RuntimeException("cause")
       val arg1 = "arg1"
-      val arg2 = new Integer(1)
+      val arg2 = Integer.valueOf(1)
       val arg3 = "arg3"
       val underlying = mock[org.slf4j.Logger]
       when(p(underlying)(marker)).thenReturn(isEnabled)

src/test/scala/com/typesafe/scalalogging/LoggerWithTaggedArgsSpec.scala

@@ -2,10 +2,8 @@ package com.typesafe.scalalogging
 
 import org.scalatest.{ Matchers, WordSpec }
 
-import java.lang.ClassCastException
 import org.slf4j.{ Logger => Underlying }
 import org.scalatestplus.mockito.MockitoSugar
-import org.mockito.ArgumentMatchers._
 import org.mockito.Mockito._
 
 object tag {
@@ -24,8 +22,6 @@ class LoggerWithTaggedAargsSpec extends WordSpec with MockitoSugar with Matchers
 
   trait Tag
 
-  import tag._
-
   "Calling error with tagged args" should {
 
     "not throw ClassCastException when varargs are passed" in {