The issue seems to be in the part called "mairobot". I would recommend to try the "recommended resolution":
Check the build logs (search in the web for the error messages you got)
Check the part mairobot configuration in the snapcraft.yaml
Check if the sources configured there are correct and available
I just searched the web for the error message "gzip: stdin: unexpected end of file". This is what I found in a public forum.
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