Bump @primer/octicons from 19.20.0 to 19.21.0

Bumps [@primer/octicons](https://github.com/primer/octicons) from 19.20.0 to 19.21.0.
- [Release notes](https://github.com/primer/octicons/releases)
- [Changelog](https://github.com/primer/octicons/blob/main/CHANGELOG.md)
- [Commits](primer/octicons@v19.20.0...v19.21.0)

---
updated-dependencies:
- dependency-name: "@primer/octicons"
  dependency-version: 19.21.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -25,7 +25,7 @@
     "@11ty/eleventy": "3.1.2",
     "@11ty/eleventy-fetch": "5.1.0",
     "@biomejs/biome": "^2.2.7",
-    "@primer/octicons": "19.20.0",
+    "@primer/octicons": "19.21.0",
     "sass-embedded": "1.93.3",
     "stylelint": "16.25.0",
     "stylelint-config-recess-order": "7.4.0",