T0003_BasicTest: Use CommitBuilder.setEncoding(Charset)

Change-Id: I1c4cdd4b856d715a204030d2de25ef91977186c2
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/T0003_BasicTest.java

@@ -47,6 +47,7 @@
 package org.eclipse.jgit.internal.storage.file;
 
 import static java.nio.charset.StandardCharsets.ISO_8859_1;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
@@ -521,7 +522,7 @@ public class T0003_BasicTest extends SampleDataRepositoryTestCase {
 				4294967295000L, 60));
 		commit.setCommitter(new PersonIdent("Joe Hacker", "joe2@example.com",
 				4294967295000L, 60));
-		commit.setEncoding("UTF-8");
+		commit.setEncoding(UTF_8);
 		commit.setMessage("\u00dcbergeeks");
 		ObjectId cid = insertCommit(commit);
 		assertEquals("4680908112778718f37e686cbebcc912730b3154", cid.name());