cache: remove http-api dependency

This was only for the xtea client, which we don't use anymore anyway. Instead allow XteaKeyManager to read from an input stream.

cache/src/test/java/net/runelite/cache/MapDumperTest.java

@@ -65,7 +65,6 @@ public class MapDumperTest
 		File base = StoreLocation.LOCATION,
 			outDir = folder.newFolder();
 		XteaKeyManager keyManager = new XteaKeyManager();
-		keyManager.loadKeys();
 
 		try (Store store = new Store(base))
 		{
@@ -121,7 +120,6 @@ public class MapDumperTest
 		Storage storage = store.getStorage();
 		Index index = store.getIndex(IndexType.MAPS);
 		XteaKeyManager keyManager = new XteaKeyManager();
-		keyManager.loadKeys();
 
 		for (int i = 0; i < MAX_REGIONS; ++i)
 		{