chore(deps): bump next from 14.2.15 to 14.2.21 (#5752)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Josh Black <joshblack@github.com>

Author: dependabot[bot]

examples/theming/package.json

@@ -13,7 +13,7 @@
     "@primer/octicons-react": "^19.14.0",
     "@primer/react": "37.15.0",
     "clsx": "^1.2.1",
-    "next": "^14.2.15",
+    "next": "^14.2.21",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "styled-components": "5.x",