BUG: Unchecked outFile.Close() error in runUpdateCLI

[andrinoff]

Describe the bug

In runUpdateCLI() (main.go:3310), after writing the downloaded asset to disk with io.Copy, outFile.Close() is called without checking the returned error. If Close() fails (e.g., disk full), the written data may be incomplete but the update proceeds.

To reproduce

1. Trigger an update with a nearly-full disk
2. The file may be incomplete but the update continues

Expected behavior

outFile.Close() error should be checked and returned if non-nil.

[floatpanebot]

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