fix: soot-infoflow-android/pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-COMGOOGLEPROTOBUF-173761

Author: snyk-bot

soot-infoflow-android/pom.xml

@@ -136,7 +136,7 @@
 		<dependency>
 			<groupId>com.google.protobuf</groupId>
 			<artifactId>protobuf-java</artifactId>
-			<version>2.5.0</version>
+			<version>3.4.0</version>
 		</dependency>
 	</dependencies>