Specify --java_runtime_version explicitly
Specify --java_runtime_version explicitly

Sets the Java runtime version to use for executing the tests to the
matrix JDK version.

Also removes the redundant -c opt flag which is already contained in the
.bazelrc.

CodeIntelligenceTesting/jazzer,CodeIntelligenceTesting/jazzer,CodeIntelligenceTesting/jazzer,CodeIntelligenceTesting/jazzer,CodeIntelligenceTesting/jazzer