Bump camel-xstream from 3.20.5 to 3.20.6

Bumps camel-xstream from 3.20.5 to 3.20.6.

---
updated-dependencies:
- dependency-name: org.apache.camel:camel-xstream
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

approvaltests-tests/pom.xml

@@ -107,7 +107,7 @@
         <dependency>
             <groupId>org.apache.camel</groupId>
             <artifactId>camel-xstream</artifactId>
-            <version>3.20.5</version>
+            <version>3.20.6</version>
         </dependency>
 
         <dependency>

approvaltests/pom.xml

@@ -22,7 +22,7 @@
         <dependency>
             <groupId>org.apache.camel</groupId>
             <artifactId>camel-xstream</artifactId>
-            <version>3.20.5</version>
+            <version>3.20.6</version>
             <optional>true</optional>
         </dependency>
         <dependency>