XWIKI-8178: Upgrade to Xalan 2.7.1

xwiki-platform-core/pom.xml

@@ -118,6 +118,12 @@
         <artifactId>tika-parsers</artifactId>
         <version>1.2</version>
       </dependency>
+      <!-- Used by several projects (HTMLCleaner, Formula renderer, etc.) directly or indirectly to do XPath and XSLT transformations -->
+      <dependency>
+        <groupId>xalan</groupId>
+        <artifactId>xalan</artifactId>
+        <version>2.7.1</version>
+      </dependency>
       <!-- Standard dependencies used in GWT modules -->
       <dependency>
         <groupId>com.google.gwt</groupId>

xwiki-platform-core/xwiki-platform-formula/xwiki-platform-formula-renderer/pom.xml

@@ -102,7 +102,6 @@
     <dependency>
       <groupId>xalan</groupId>
       <artifactId>xalan</artifactId>
-      <version>2.5.1</version>
       <scope>runtime</scope>
     </dependency>
     <!-- Testing dependencies -->