Add checker-qual external dependency version entry

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: browndav-msft

eng/versioning/external_dependencies.txt

@@ -191,6 +191,7 @@ org.apache.maven.plugins:maven-shade-plugin;3.6.0
 org.apache.maven.plugins:maven-site-plugin;3.21.0
 org.apache.maven.plugins:maven-source-plugin;3.3.1
 org.apache.maven.plugins:maven-surefire-plugin;3.5.3
+org.checkerframework:checker-qual;3.42.0
 org.codehaus.mojo:animal-sniffer-maven-plugin;1.24
 org.codehaus.mojo:build-helper-maven-plugin;3.6.1
 org.codehaus.mojo:exec-maven-plugin;3.5.1