[CONJ-628] small optimization to read metadata faster

(cherry picked from commit d92ae73)

src/main/java/org/mariadb/jdbc/internal/com/read/resultset/ColumnInformation.java

@@ -231,7 +231,7 @@ private String getString(int idx) {
         for (int i = 0; i < idx; i++) {
             buffer.skipLengthEncodedBytes();
         }
-        return new String(buffer.getLengthEncodedBytes(), Buffer.UTF_8);
+        return buffer.readStringLengthEncoded(Buffer.UTF_8);
     }
 
     public String getDatabase() {