Update dependency isbot to v5.1.12

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
isbot (source)	5.1.11 -> 5.1.12

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Release Notes

omrilotan/isbot (isbot)

### [`v5.1.12`](https://togithub.com/omrilotan/isbot/blob/HEAD/CHANGELOG.md#5112) [Compare Source](https://togithub.com/omrilotan/isbot/compare/v5.1.11...v5.1.12) - \[Pattern] Pattern updates: [Project LightSpeed](https://engineering.fb.com/2020/03/02/data-infrastructure/messenger/) browsers are not bots

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