Handle panic if serde cannot parse JSON/request failure on channel override

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Replication: applejuicecli --install player asdf

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error("missing field `clientVersionUpload`", line: 1, column: 125)', src/utils/installation.rs:147:68
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Noticed this after Roblox started locking and restricting deployment channels

[WaviestBalloon]

1c76607