Bump ch.vorburger.exec to 3.1.3 (fixes #501)

for vorburger/ch.vorburger.exec#60
and vorburger/ch.vorburger.exec#58

see https://github.com/vorburger/MariaDB4j/issues/501

mariaDB4j-core/pom.xml

@@ -22,7 +22,7 @@
         <dependency>
             <groupId>ch.vorburger.exec</groupId>
             <artifactId>exec</artifactId>
-            <version>3.1.2</version>
+            <version>3.1.3</version>
         </dependency>
         <dependency>
             <groupId>org.apache.commons</groupId>