Upgrades the mozrunner crate dependency by pinning it to 0.4.1. With `./mach vendor rust' I could not find any other way to force a new version to be downloaded because cargo, as far as I understand, does not yet support using crates.io as a fallback.
This patch also pins the mozprofile and mozversion dependencies exactly, although this is strictly not needed yet because they we have the latest versions vendored in-tree.
MozReview-Commit-ID: 8emDKbiYd0S
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extra : rebase_source : c153506f481255b2f9362e94da3254013ad522ab
Update dependencies for mozrunner (0.4) and mozprofile (0.3) to
stop setting default preferences by mozrunner. This will also allow
to overwrite all preferences now via the moz:firefoxOptions capability.
MozReview-Commit-ID: IU0oKzRnnfG
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extra : rebase_source : 7f8946f7e22af9beebaddc52c78d549ddc898c87