Update dependency tailwindcss to v3.1.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
tailwindcss (source)	3.1.5 -> 3.1.6

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Release Notes

tailwindlabs/tailwindcss

### [`v3.1.6`](https://togithub.com/tailwindlabs/tailwindcss/blob/HEAD/CHANGELOG.md#​316---2022-07-11) [Compare Source](https://togithub.com/tailwindlabs/tailwindcss/compare/v3.1.5...v3.1.6) ##### Fixed - Fix usage on Node 12.x ([b4e637e](https://togithub.com/tailwindlabs/tailwindcss/commit/b4e637e2e096a9d6f2210efba9541f6fd4f28e56)) - Handle theme keys with slashes when using `theme()` in CSS ([#​8831](https://togithub.com/tailwindlabs/tailwindcss/pull/8831))

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Configuration

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