fix(deps): update dependency shiki to v3.20.0

Signed-off-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

pnpm-workspace.yaml

@@ -86,7 +86,7 @@ catalogs:
     tailwindcss: 4.1.17
     tailwindcss-animate: 1.0.7
   syntax:
-    shiki: 3.18.0
+    shiki: 3.20.0
   test:
     '@testing-library/jest-dom': 6.9.1
     '@testing-library/react': 16.3.0