Update dependency chokidar to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
chokidar	^3.6.0 -> ^4.0.3

---

• If you want to rebase/retry this PR, check this box

[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: package-lock.json

npm error code ERESOLVE
npm error ERESOLVE could not resolve
npm error
npm error While resolving: nunjucks@3.2.4
npm error Found: chokidar@4.0.3
npm error node_modules/chokidar
npm error   dev chokidar@"^4.0.3" from the root project
npm error   chokidar@"^4.0.0" from sass@1.83.4
npm error   node_modules/sass
npm error     dev sass@"^1.83.4" from the root project
npm error     sass@"^1.71.1" from esbuild-sass-plugin@3.3.1
npm error     node_modules/esbuild-sass-plugin
npm error       dev esbuild-sass-plugin@"^3.3.1" from the root project
npm error
npm error Could not resolve dependency:
npm error peerOptional chokidar@"^3.3.0" from nunjucks@3.2.4
npm error node_modules/nunjucks
npm error   nunjucks@"^3.2.4" from the root project
npm error
npm error Conflicting peer dependency: chokidar@3.6.0
npm error node_modules/chokidar
npm error   peerOptional chokidar@"^3.3.0" from nunjucks@3.2.4
npm error   node_modules/nunjucks
npm error     nunjucks@"^3.2.4" from the root project
npm error
npm error Fix the upstream dependency conflict, or retry
npm error this command with --force or --legacy-peer-deps
npm error to accept an incorrect (and potentially broken) dependency resolution.
npm error
npm error
npm error For a full report see:
npm error /runner/cache/others/npm/_logs/2025-03-03T14_53_32_859Z-eresolve-report.txt
npm error A complete log of this run can be found in: /runner/cache/others/npm/_logs/2025-03-03T14_53_32_859Z-debug-0.log

[pipwilson]

I don't think we can ever(?) merge this - nunjucks needs a peer dependency in the v3 range and hasn't had a release (or any commits!) for two years. I suggest we put this in our ignoreDeps config for renovate.