fix(dev): websocket heartbeat

[pcattori]

Applies changes in #6904 to both dev servers (old and new) and targets dev branch

[changeset-bot]

🦋 Changeset detected

Latest commit: 6c33e62

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 18 packages

Name	Type
@remix-run/dev	Patch
create-remix	Patch
remix	Patch
@remix-run/architect	Patch
@remix-run/cloudflare	Patch
@remix-run/cloudflare-pages	Patch
@remix-run/cloudflare-workers	Patch
@remix-run/css-bundle	Patch
@remix-run/deno	Patch
@remix-run/eslint-config	Patch
@remix-run/express	Patch
@remix-run/netlify	Patch
@remix-run/node	Patch
@remix-run/react	Patch
@remix-run/serve	Patch
@remix-run/server-runtime	Patch
@remix-run/testing	Patch
@remix-run/vercel	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[brophdawg11]

We don't need to PR this to dev, it'll get there when we merge release-hotfix in. But do we need to make the v2 changes (packages/remix-dev/devServer_unstable/socket.ts) in release-hotfix?

[brophdawg11]

nvm - Jason has a PR to main that has it - #6927. I'm going to close this and both updates will make it to dev with the release