Update dependency textual-dev to v1.6.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
textual-dev	==1.5.1 -> ==1.6.1

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.54%. Comparing base (ee85104) to head (17eb143).
Report is 86 commits behind head on dev.

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