observerward: fix test when built with rust 1.67.0

[ZhongRuoyu]

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In #121561 observerward segfaulted due to an undefined behaviour in dependency prettytable-rs (see phsym/prettytable-rs#145). That could be fixed by bumping prettytable-rs to 0.10.0, which upstream has done in 0x727/ObserverWard#103.

[ZhongRuoyu]

==> cargo update --package prettytable-rs --precise 0.10.0
    Updating crates.io index
warning: spurious network error (2 tries remaining): SecureTransport error: connection closed via error; class=Net (12)
warning: spurious network error (1 tries remaining): SecureTransport error: connection closed via error; class=Net (12)
error: Unable to update registry `crates-io`

Triggering a new run.

[chenrui333]

rebase per the rust 1.67.0 merge

[BrewTestBot]

🤖 A scheduled task has triggered a merge.