Add deploying state for offline upgrade

Deploying state for offline upgrade. While updating bundle file in offline, noticed that SystemUpgradeState follow state Checking -> Pending then reboot the device. There is the missing of state deploying and same is added

Signed-off-by: Gireesh Hiremath Gireesh.Hiremath@in.bosch.com

requested review from @sjoerd

requested review from @fdanis and removed review request for @sjoerd

added 4 commits

• 618236de...9c8b5239 - 2 commits from branch apertis/v2022dev3
• 22498aa0 - Add deploying state for offline upgrade
• 58fd0588 - Add decrypting state

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added 1 commit

• 7506da64 - Release apertis-update-manager version 0.2020.25

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merged