chore: remove clirr baseline version (#1071)

By default, this will now compare against the latest version available
on Maven Central.

Author: chingor13

clirr-ignored-differences.xml

@@ -484,8 +484,7 @@
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>clirr-maven-plugin</artifactId>
         <configuration>
-          <comparisonVersion>1.19.0</comparisonVersion>
-          <ignoredDifferencesFile>${basedir}/../clirr-ignored-differences.xml</ignoredDifferencesFile>
+          <ignoredDifferencesFile>clirr-ignored-differences.xml</ignoredDifferencesFile>
           <logResults>true</logResults>
         </configuration>
         <executions>