style: remove unused (& illegal) Spring @Value import from SystemConfigTest

Author: poikilotherm

src/test/java/edu/harvard/iq/dataverse/util/SystemConfigTest.java

@@ -12,7 +12,6 @@
 import org.mockito.InjectMocks;
 import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
-import org.springframework.beans.factory.annotation.Value;
 
 import java.util.Map;