build: update dependency io_bazel_rules_webtesting to v0.4.0 -

[angular-robot]

This PR contains the following updates:

Package	Type	Update	Change
io_bazel_rules_webtesting	http_archive	minor	0.3.5 -> 0.4.0

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Release Notes

bazelbuild/rules_webtesting (io_bazel_rules_webtesting)

v0.4.0: Release rules_webtesting 0.4.0

Compare Source

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Configuration

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This PR has been generated by Renovate Bot.

[dgp1130]

This PR is bad as @rules_webtesting seems to have changed its URL format and I don't have permission to update it. Forked to a separate PR: #30476

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