JCefSampleApp for 135.0.20

Update JCEF to ca49ada

Build: GitHub Actions #56
JCEF maven version: 135.0.20

Test the resulting build on your platform:

java -jar jcefsampleapp-135.0.20-jar-with-dependencies.jar

Make sure to include the required module opens when running on JDK 16 or later. You can find them here.

Warning: This will destroy any directory called jcef-bundle in your current work dir!