Update Rust crate rlua to ^0.19.7

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
rlua	dependencies	patch	^0.19.5 -> ^0.19.7

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Release Notes

amethyst/rlua (rlua)

### [`v0.19.7`](https://togithub.com/amethyst/rlua/blob/HEAD/CHANGELOG.md#0197) [Compare Source](https://togithub.com/amethyst/rlua/compare/v0.19.6...v0.19.7) - Cosmetic fixes to README.md ### [`v0.19.6`](https://togithub.com/amethyst/rlua/blob/HEAD/CHANGELOG.md#0196) [Compare Source](https://togithub.com/amethyst/rlua/compare/v0.19.5...v0.19.6) - Initial support for LuaJIT (thanks lazytiger)

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Configuration

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🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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