Linux Cmdline Upgrade version typo

[jaco101]

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https://github.com/getumbrel/umbrel/blob/5fb00dbe1769f0c5142276dc16cad3774d23003c/scripts/update/update#L86C13-L86C58

The '--repo' & '--path' upgrade on Linux command line reference the version (e.g. '0.5.4') without the 'v' in release folder and fails. : ~umbrel/scripts/update/update --repo getumbrel/umbrel#v0.5.4

The script (from JSON parsing) reference:

• wrong: https://github.com/getumbrel/umbrel/releases/download/0.5.4/umbreld-0.5.4-amd64.tar.gz ...but it should be:
• correct: https://github.com/getumbrel/umbrel/releases/download/v0.5.4/umbreld-v0.5.4-amd64.tar.gz

Notice the 'v' missing in front of both 'versions' (v0.5.4)