fix(deps): update dependency @stoplight/spectral-core to v1.18.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@stoplight/spectral-core	1.18.0 -> 1.18.1

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Release Notes

stoplightio/spectral (@​stoplight/spectral-core)

### [`v1.18.1`](https://togithub.com/stoplightio/spectral/compare/@stoplight/spectral-core-v1.18.0...@stoplight/spectral-core-1.18.1) [Compare Source](https://togithub.com/stoplightio/spectral/compare/@stoplight/spectral-core-v1.18.0...@stoplight/spectral-core-1.18.1)

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