Bump scalatest_2.13 from 3.2.12 to 3.2.15 (#255)

Author: dependabot[bot]

build.gradle

@@ -99,7 +99,7 @@ dependencies {
 	implementation "org.scala-lang:scala-library:${scalaBinaryVersion}"
 
 	// TEST Scala //
-	testImplementation "org.scalatest:scalatest_${scalaVersion}:3.2.12"
+	testImplementation "org.scalatest:scalatest_${scalaVersion}:3.2.15"
 	testImplementation 'com.vladsch.flexmark:flexmark-all:0.64.0'
 
 	// Linter Scala //