chore: bump jenkins to version 2.568.1

Author: snapcrafters-bot

snap/snapcraft.yaml

@@ -13,7 +13,7 @@ issues: https://github.com/snapcrafters/jenkins/issues
 source-code: https://github.com//snapcrafters/jenkins
 license: MIT
 icon: snap/local/jenkins.png
-version: '2.555.3'
+version: '2.568.1'
 base: core22
 confinement: classic
 grade: stable