Update dependency textual to v0.86.3 - autoclosed

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
textual	0.86.1 -> 0.86.3

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Release Notes

Textualize/textual (textual)

v0.86.3

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Changed

• Updated the tutorial (text and code) https://github.com/Textualize/textual/pull/5257

Fixed

• Fixed a glitch with the scrollbar that occurs when you hold a to add stopwatches in the tutorial app https://github.com/Textualize/textual/pull/5257

v0.86.2

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Fixed

• Fixed visibility glitch for widgets with an offset https://github.com/Textualize/textual/pull/5253
• Fixed theme variables being unavailable in code until refresh_css was called https://github.com/Textualize/textual/pull/5254

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Configuration

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