[Snyk] Security upgrade webpack-dev-server from 2.9.4 to 3.11.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • examples/package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Denial of Service (DoS) SNYK-JS-SOCKJS-575261	Yes	Proof of Concept

Commit messages

Package name: webpack-dev-server

The new version differs by 250 commits.

• 4ab1f21 chore(release): 3.11.0
• 0e51fb1 fix: invalidate route (#2584)
• f857c40 chore: deps and tests
• 41d1d0c fix(deps): security vulnerability in yargs-parser (#2566)
• 375ab23 ci: add node@14 (#2530)
• 776e7d4 chore(deps): update dependency html-entities to ^1.3.1 (master) (#2513)
• 984536c chore: update lint-staged config (#2524)
• 89ffb86 feat: add invalidate endpoint (#2493)
• 0e9bffb chore(deps): update all patch dependencies (#2508)
• 99ccfd8 fix: update jquery (#2516)
• 06583f2 fix: do not swallow errors from server (#2512)
• 0d5c681 fix(server): don't crash on setupExitSignals(undefined) (#2507)
• c436058 chore(deps): update all patch dependencies (master) (patch) (#2503)
• 4808abd feat(progess): emit progress-update (#2498)
• adeb92e feat: allow open option to accept an object (#2492)
• c6bdfe4 feat(contentBasePublicPath): allow multiple paths (#2489)
• f317358 chore(deps): update all patch dependencies (master) (patch) (#2481)
• de763e9 chore(deps): update all minor dependencies (master) (minor) (#2473)
• f7b6fa1 chore(deps): update package-lock.json (#2482)
• 3bf43a7 chore(deps): update all patch dependencies (#2477)
• 12d76be docs: fix typos across the project (#2452)
• 9a6e4a1 chore(deps): update all patch dependencies (#2468)
• d4739f8 chore(deps): update dependency husky to v4 (#2383)
• 5f357f3 chore(deps): update all patch dependencies (#2450)

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