Resource leak in SvmConnector: FileInputStream not closed

## Description
There is a resource leak in `SvmConnector.createSslSocketFactoryForSVM()` method at line 88.

## Location
File: `backend/common/src/main/java/org/eclipse/sw360/datahandler/db/SvmConnector.java`
Line: 88

## Issue
trustStore.load(new FileInputStream(javaKeystoreFilename), JAVA_KEYSTORE_PASSWORD);

