chore: bump biome $schema to match pinned CLI 2.4.11

[EduardF1]

What and why

The repo pins @biomejs/biome to ^2.4.11 (package.json, resolved to 2.4.11 in the lockfile), but biome.jsonc still declares the 2.3.0 $schema. The pinned CLI reports the drift on every run:

> npx @biomejs/biome@2.4.11 check biome.jsonc
  i The configuration schema version does not match the CLI version 2.4.11
  i   Expected:  2.4.11
      Found:     2.3.0
  i Run the command biome migrate to migrate the configuration file.

Changes

• biome.jsonc: $schema bumped from 2.3.0 to 2.4.11, generated by biome migrate --write. One line, nothing else.

Validation

• npx @biomejs/biome@2.4.11 lint .: same result as main (2 warnings, 1 info, no errors).
• npx @biomejs/biome@2.4.11 check biome.jsonc: the schema-mismatch notice is gone.

Separately, npm run format on main currently rewrites 8 files (scripts/extractVsix.mts, scripts/prerelease.mts, scripts/tsnocheck.mts, src/reporter/fullJsonStreamReporter.ts, src/runtime/settings.ts, src/test/integration/yarn.test.ts, src/test/util.ts, src/workspaceWatcher.ts). That is left out of this PR on purpose; I can open it as a follow-up if you want it.

[EduardF1]

Friendly ping — just flagging this biome schema chore is still open. Happy to rebase or adjust anything if it helps; no rush.