Bug 1983107 - Update to jexl-eval 0.4.0 [ci full]

[freshstrangemusic]

Nimbus now exposes a test only recordEventSync method to use in tests becuase recordEvent dispatches the event recording to a background thread. Because the new JEXL parser is so fast, our EventStoreTests are now intermittently failing as the event recording hasn't finished by the time we actually evaluate the JEXL expressions. Using recordEventSync bypasses this issue entirely.

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[freshstrangemusic]

We shouldn't merge this yet because there is a potential issue with this patch on iOS.

[mhammond]

dep check could well be because upstream renamed their branch or something - regardless, I agree it's not this patch, and Jeff asked me to land it NOW :)