Bump gocui (and tcell)

[stefanhaller]

This updates our tcell dependency to v2.8.0, adding support for ghostty and tmux-256color.

This will hopefully fix #4133, and it might also fix #2962 and #3434 (but I don't understand enough about these to tell).

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for a1a8cd11	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (a1a8cd1)	Report Missing	Report Missing	Report Missing
Head commit (274e24d)	51749	44716	86.41%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#4166)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[jesseduffield]

LGTM