[master] Bump version of jdl after publishing .56
[master] Bump version of jdl after publishing .56

jenkinsci/jenkins-design-language,kzantow/blueocean-plugin,alvarolobato/blueocean-plugin,jenkinsci/blueocean-plugin,jenkinsci/blueocean-plugin,kzantow/blueocean-plugin,jenkinsci/blueocean-plugin,alvarolobato/blueocean-plugin,kzantow/blueocean-plugin,cliffmeyers/jenkins-design-language,alvarolobato/blueocean-plugin,jenkinsci/jenkins-design-language,cliffmeyers/jenkins-design-language,kzantow/blueocean-plugin,alvarolobato/blueocean-plugin,jenkinsci/blueocean-plugin,jenkinsci/blueocean-plugin,cliffmeyers/jenkins-design-language