Update dependency webpack-dev-server to v5.2.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
webpack-dev-server	5.2.5 → 5.2.6

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Release Notes

webpack/webpack-dev-server (webpack-dev-server)

v5.2.6

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Patch Changes

• fix: allow undefined as the Server constructor options argument again (by @​bjohansebas in #​5695)

  Restores accepting undefined (defaulting it to {}) for the options
  argument, so passing a webpack config's optional devServer field type-checks and works as before.

• Protect the built-in state-changing routes (/webpack-dev-server/invalidate and /webpack-dev-server/open-editor) against cross-site request forgery. Requests are now checked with Sec-Fetch-Site (falling back to an Origin/Host comparison when it is absent), so a cross-site page can no longer trigger a rebuild or open a file in the editor. Same-origin requests, user-initiated navigations, and non-browser clients (e.g. curl) are unaffected. (by @​bjohansebas in #​5698)

• Handle malformed Host and Origin header values gracefully when validating requests. (by @​bjohansebas in #​5699)

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