bump snakeyaml to 1.33

Author: frantuma

pom.xml

@@ -969,6 +969,6 @@
         <surefire-version>2.19.1</surefire-version>
         <jmockit-version>1.25</jmockit-version>
         <reflections-version>0.9.11</reflections-version>
-        <snakeyaml-version>1.30</snakeyaml-version>
+        <snakeyaml-version>1.33</snakeyaml-version>
     </properties>
 </project>