fix(ci): Fix bench job

[olivierlemasle]

Fixes bench CI job, which is failing on dev branch (webkit2gtk-4.1 is not available for ubuntu-20.04).

What kind of change does this PR introduce?

• Bugfix
• Feature
• Docs
• New Binding issue #___
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change?

• Yes, and the changes were approved in issue #___
• No

Checklist

• When resolving issues, they are referenced in the PR's title (e.g fix: remove a typo, closes #___, #___)
• A change file is added if any packages will require a version bump due to this PR per the instructions in the readme.
• I have added a convincing reason for adding this feature, if necessary

Other information

[lucasfernog]

Our benchmark CI is completely broken :( it runs forever.

[olivierlemasle]

Well, that wasn't expected 🤷‍♂️

I'll look at it.

[olivierlemasle]

@lucasfernog I've fixed the benchmarks, which were running forever because they are normally stopped by a Tauri command, and window.__TAURI__.invoke was used, so the command was never invoked.

This time, I tested it in a GitHub fork ;-)

I've also fixed some Clippy warnings, and I've added the package at-spi2-core to remove these warnings (cf #4315):

AT-SPI: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files

---

If you want to make sure a future Tauri breakage will not make the benchmarks run forever as it did, I can add a timeout. Hyperfine does not support this (cf. sharkdp/hyperfine#106) but we can wrap the command by a timeout command.