observerward: fix test when built with rust 1.67.0

[ZhongRuoyu]

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

---

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 https://github.com/0x727/ObserverWard/pull/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.