fix(deps): update dependency @tryghost/string to v0.2.21

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@tryghost/string (source)	0.2.15 → 0.2.21

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Release Notes

TryGhost/SDK (@​tryghost/string)

v0.2.21

Compare Source

v0.2.20

Compare Source

v0.2.19

Compare Source

v0.2.17

Compare Source

v0.2.16

Compare Source

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.18%. Comparing base (5280496) to head (352e5a6).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #207   +/-   ##
=======================================
  Coverage   90.18%   90.18%           
=======================================
  Files         112      112           
  Lines        7621     7621           
  Branches     1092     1092           
=======================================
  Hits         6873     6873           
  Misses        740      740           
  Partials        8        8           

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