Bump doxia-module-markdown from 1.9.1 to 1.11.1 (#783)

Bumps doxia-module-markdown from 1.9.1 to 1.11.1.

---
updated-dependencies:
- dependency-name: org.apache.maven.doxia:doxia-module-markdown
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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pom.xml

@@ -239,7 +239,7 @@
                     <dependency>
                         <groupId>org.apache.maven.doxia</groupId>
                         <artifactId>doxia-module-markdown</artifactId>
-                        <version>1.9.1</version>
+                        <version>1.11.1</version>
                     </dependency>
                 </dependencies>
             </plugin>