fix(deps): update module github.com/charmbracelet/x/cellbuf to v0.0.15

[botty-mcbottington]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/charmbracelet/x/cellbuf	v0.0.14 → v0.0.15

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This PR has been generated by Renovate Bot.

[botty-mcbottington]

ℹ️ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• 4 additional dependencies were updated

Details:

Package	Change
github.com/charmbracelet/x/ansi	v0.11.4 -> v0.11.5
github.com/charmbracelet/colorprofile	v0.3.3 -> v0.4.1
github.com/clipperhouse/displaywidth	v0.7.0 -> v0.9.0
github.com/clipperhouse/uax29/v2	v2.3.0 -> v2.5.0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.65%. Comparing base (837a5ab) to head (ea05ae7).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #276   +/-   ##
=======================================
  Coverage   49.65%   49.65%           
=======================================
  Files          67       67           
  Lines        6400     6400           
=======================================
  Hits         3178     3178           
  Misses       3050     3050           
  Partials      172      172           

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