update maven dependencies for java 10 compatibilities

[INFO] Building jar: C:\projects\mariadb\mariadb-connector-j-5\target\mariadb-java-client-2.2.7-SNAPSHOT-javadoc.jar

[INFO] 

[INFO] --- maven-checkstyle-plugin:2.17:check (process-test-resources) @ mariadb-java-client ---

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[INFO] BUILD FAILURE

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[INFO] Total time: 17.629 s

[INFO] Finished at: 2018-09-03T14:32:45+02:00

[INFO] Final Memory: 40M/144M

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[ERROR] Failed to execute goal org.apache.maven.plugins:maven-checkstyle-plugin:2.17:check (process-test-resources) on project mariadb-java-client: Execution process-test-resources of goal org.apache.maven.plugins:maven-checkstyle-plugin:2.17:check failed: Plugin org.apache.maven.plugins:maven-checkstyle-plugin:2.17 or one of its dependencies could not be resolved: Could not find artifact com.sun:tools:jar:1.7.0 at specified path C:\Program Files\Java\jdk-10.0.2/../lib/tools.jar -> [Help 1]

[ERROR]