Upgrade Kafka dependencies to 3.9.1 and set scope to compileOnly (#8)

* Upgrade Kafka dependencies to 3.9.1 and set scope to compileOnly
Upgrade junit dependencies

* Fix removed Utils.join method

Author: AlexisSouquiere

build.gradle

@@ -18,12 +18,16 @@ repositories {
 
 dependencies {
 
-    implementation 'org.apache.kafka:connect-api:3.1.2'
-    implementation 'org.apache.kafka:connect-transforms:3.1.2'
-    implementation 'org.apache.kafka:kafka_2.13:3.1.2'
+    compileOnly 'org.apache.kafka:connect-api:3.9.1'
+    compileOnly 'org.apache.kafka:connect-transforms:3.9.1'
+    compileOnly 'org.apache.kafka:kafka_2.13:3.9.1'
 
+    testImplementation 'org.apache.kafka:connect-api:3.9.1'
+    testImplementation 'org.apache.kafka:connect-transforms:3.9.1'
+    testImplementation 'org.apache.kafka:kafka_2.13:3.9.1'
     // Use JUnit Jupiter for testing.
-    testImplementation 'org.junit.jupiter:junit-jupiter:5.9.0'
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.14.0'
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher:1.14.0'
 }
 java {
     sourceCompatibility = '11'

src/main/java/com/michelin/kafka/connect/transforms/TimestampMicrosConverter.java

@@ -279,7 +279,7 @@ public void configure(final Map<String, ?> pConfigs) {
 
         if (!VALID_TYPES.contains(type)) {
             throw new ConfigException("Unknown timestamp type in TimestampConverter: " + type + ". Valid values are "
-                                      + Utils.join(VALID_TYPES, ", ") + ".");
+                                      + String.join(", ", VALID_TYPES) + ".");
         }
         if (type.equals(TYPE_STRING) && formatPattern.trim().isEmpty()) {
             throw new ConfigException("TimestampConverter requires format option to be specified when using string timestamps");