use "org.junit:junit-bom" to inject proper versions of all JUnit depe…

…ndencies

currently we have a conflict between "junit-platform-engine" and "junit-platform-launcher" (one of them seems to be hard-coded in Gradle).

build.gradle

@@ -4,7 +4,6 @@ defaultTasks 'clean', 'test'
 ext {
   selenideVersion = '7.7.3'
   junitVersion = '5.12.0'
-  junitPlatformVersion = '1.12.0'
   assertjVersion = '3.27.3'
   slf4jVersion = '2.0.16'
 }
@@ -23,10 +22,13 @@ repositories{
 dependencies {
   testImplementation "com.codeborne:selenide:$selenideVersion"
   testImplementation "com.codeborne:selenide-full-screenshot:$selenideVersion"
-  testImplementation "org.junit.jupiter:junit-jupiter-engine:$junitVersion"
-  testImplementation "org.junit.jupiter:junit-jupiter-params:$junitVersion"
-  testImplementation "org.junit.platform:junit-platform-engine:$junitPlatformVersion"
-  testImplementation "org.junit.platform:junit-platform-launcher:$junitPlatformVersion"
+
+  testImplementation platform("org.junit:junit-bom:$junitVersion")
+  testImplementation "org.junit.jupiter:junit-jupiter-engine"
+  testImplementation "org.junit.jupiter:junit-jupiter-params"
+  testImplementation "org.junit.platform:junit-platform-engine"
+  testImplementation "org.junit.platform:junit-platform-launcher"
+
   testImplementation "org.assertj:assertj-core:$assertjVersion"
   testImplementation "org.slf4j:slf4j-api:$slf4jVersion"
   testRuntimeOnly "org.slf4j:slf4j-simple:$slf4jVersion"