Remove YAML Base64 serialization hack (MID-4974)

The original issue 90 in jackson was fixed, so we removed
our hacked workaround.

infra/prism-impl/src/main/java/com/evolveum/midpoint/prism/impl/lex/json/yaml/MidpointYAMLGenerator.java

@@ -69,41 +69,4 @@ public void newDocument() throws IOException {
         _emitter.emit(new DocumentEndEvent(null, null, false));
         _emitter.emit(new DocumentStartEvent(null, null, true, version, Collections.emptyMap()));
     }
-
-    /*
-     * UGLY HACK - working around YAML serialization problem
-     * (https://github.com/FasterXML/jackson-dataformats-text/issues/90)
-     *
-     * TODO - after YAML problem is fixed, remove this code block (MID-4974)
-     * TODO - if upgrading YAML library before that, make sure everything works (because this code is almost literally copied from YAMLGenerator class)
-     */
-
-    @Override
-    public void writeBinary(Base64Variant b64variant, byte[] data, int offset, int len) throws IOException
-    {
-        if (data == null) {
-            writeNull();
-            return;
-        }
-        _verifyValueWrite("write Binary value");
-        if (offset > 0 || (offset+len) != data.length) {
-            data = Arrays.copyOfRange(data, offset, offset+len);
-        }
-        writeScalarBinaryPatched(b64variant, data);
-    }
-
-    private final static ImplicitTuple EXPLICIT_TAGS = new ImplicitTuple(false, false);
-    private final static Character STYLE_LITERAL = '|';
-    private final static Character STYLE_BASE64 = STYLE_LITERAL;
-
-    private void writeScalarBinaryPatched(Base64Variant b64variant, byte[] data) throws IOException
-    {
-        String encoded = b64variant.encode(data);
-        _emitter.emit(new ScalarEvent(null, TAG_BINARY, EXPLICIT_TAGS, encoded,
-                null, null, STYLE_BASE64));
-    }
-
-    /*
-     *  END OF UGLY HACK
-     */
 }