fix: Upgrade ch.vorburger.exec from 3.1.5 to 3.2.0

See vorburger/ch.vorburger.exec@exec-3.1.5...exec-3.2.0
for the "release notes" of what all this changes. The most important one is that
this fixes vorburger/ch.vorburger.exec#9.

mariaDB4j-core/pom.xml

@@ -24,7 +24,7 @@
     <dependency>
       <groupId>ch.vorburger.exec</groupId>
       <artifactId>exec</artifactId>
-      <version>3.1.5</version>
+      <version>3.2.0</version>
     </dependency>
     <dependency>
       <groupId>org.apache.commons</groupId>