Remove deprecated RawParseUtils#UTF8_CHARSET

Change-Id: I4b3f1344f77a575b2d0e00462806eddb4e9a6b80

Author: msohn

org.eclipse.jgit/src/org/eclipse/jgit/util/RawParseUtils.java

@@ -44,14 +44,6 @@
  * Handy utility functions to parse raw object contents.
  */
 public final class RawParseUtils {
-	/**
-	 * UTF-8 charset constant.
-	 *
-	 * @since 2.2
-	 * @deprecated use {@link java.nio.charset.StandardCharsets#UTF_8} instead
-	 */
-	@Deprecated
-	public static final Charset UTF8_CHARSET = UTF_8;
 
 	private static final byte[] digits10;