Bump @primer/css from 18.2.0 to 19.1.1 (#24018)

Bumps [@primer/css](https://github.com/primer/css) from 18.2.0 to 19.1.1.
- [Release notes](https://github.com/primer/css/releases)
- [Changelog](https://github.com/primer/css/blob/main/CHANGELOG.md)
- [Commits](primer/css@v18.2.0...v19.1.1)

---
updated-dependencies:
- dependency-name: "@primer/css"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Kevin Heis <heiskr@users.noreply.github.com>

package.json

@@ -12,7 +12,7 @@
     "@github/failbot": "0.8.0",
     "@hapi/accept": "^5.0.2",
     "@primer/components": "^32.1.0",
-    "@primer/css": "^18.2.0",
+    "@primer/css": "^19.1.1",
     "@primer/octicons": "^16.1.1",
     "@primer/octicons-react": "^16.2.0",
     "@react-aria/ssr": "^3.1.0",