Fix missing Objects import in ConfigurationFileUtilsTest

[Caideyipi]

Description

Add the missing java.util.Objects import used by ConfigurationFileUtilsTest, fixing the maven-compiler-plugin:testCompile failure where Objects.requireNonNull(...) could not be resolved.

Verification

• mvn -pl iotdb-core/datanode spotless:apply
• mvn -pl iotdb-core/datanode test-compile -DskipTests (blocked locally before test compilation by existing datanode main-source/generated-source compilation errors unrelated to this import, e.g. missing generated-source dependencies/classes such as IFill, Accumulator, and ComparatorChain)