Bump xalan from 2.7.2 to 2.7.3 (#3506)

Bumps xalan from 2.7.2 to 2.7.3.

---
updated-dependencies:
- dependency-name: xalan:xalan
  dependency-type: direct:production
...

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pom.xml

@@ -494,7 +494,7 @@
             <dependency>
                 <groupId>xalan</groupId>
                 <artifactId>xalan</artifactId>
-                <version>2.7.2</version>
+                <version>2.7.3</version>
             </dependency>
             <dependency>
                 <groupId>org.hsqldb</groupId>