fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGJDOM-1309669

Author: snyk-bot

pom.xml

@@ -173,7 +173,7 @@
             <dependency>
                 <groupId>net.sourceforge.htmlcleaner</groupId>
                 <artifactId>htmlcleaner</artifactId>
-                <version>2.9</version>
+                <version>2.26</version>
             </dependency>
             <dependency>
                 <groupId>com.github.detro</groupId>