chore: exclude banner.txt from license check
This adds all `**/src/main/resource/banner.txt` files to the exclude
list so it's not checked for having a license header.
<exclude>connector/**/springboot/*Common.java </exclude><!-- auto generated without headers -->
<exclude>meta/**/run-env.sh</exclude>
<exclude>server/syndesis-builder-image-generator/image/**</exclude><!-- auto generated without headers -->
+ <exclude>**/src/main/resources/banner.txt</exclude>
</excludes>
</configuration>
<dependencies>
