Removed unused dependencies (#1607)

Author: nnegrey

texttospeech/cloud-client/pom.xml

@@ -39,11 +39,6 @@
       <artifactId>google-cloud-texttospeech</artifactId>
       <version>0.101.0-beta</version>
     </dependency>
-    <dependency>
-      <groupId>net.sourceforge.argparse4j</groupId>
-      <artifactId>argparse4j</artifactId>
-      <version>0.8.1</version>
-    </dependency>
     <!-- [END tts_java_dependencies] -->
 
     <!-- Test dependencies -->

texttospeech/cloud-client/src/main/java/com/example/texttospeech/SynthesizeFile.java

@@ -30,11 +30,6 @@
 import java.io.OutputStream;
 import java.nio.file.Files;
 import java.nio.file.Paths;
-import net.sourceforge.argparse4j.ArgumentParsers;
-import net.sourceforge.argparse4j.inf.ArgumentParser;
-import net.sourceforge.argparse4j.inf.ArgumentParserException;
-import net.sourceforge.argparse4j.inf.MutuallyExclusiveGroup;
-import net.sourceforge.argparse4j.inf.Namespace;
 
 
 /**