Bump flags from 0.2.2 to 3.1.1

Bumps [flags](https://github.com/vercel/flags) from 0.2.2 to 3.1.1.
- [Release notes](https://github.com/vercel/flags/releases)
- [Commits](https://github.com/vercel/flags/commits/[email protected])

---
updated-dependencies:
- dependency-name: flags
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package-lock.json

@@ -34,7 +34,7 @@
     "@webref/events": "file:packages/events",
     "@webref/idl": "file:packages/idl",
     "css-tree": "3.1.0",
-    "flags": "0.2.2",
+    "flags": "3.1.1",
     "mocha": "11.1.0",
     "reffy": "18.3.2",
     "rimraf": "6.0.1",