Skip HTTP/2 pseudo headers in reqres.ts

[morganwalkup]

Skips HTTP/2 pseudo headers in reqres.ts to avoid a process-killing TypeError:

node:internal/deps/undici/undici:4282
      return new TypeError(`${message.header}: ${message.message}`);
             ^

TypeError: Headers.append: ":method" is an invalid header name.
    at webidl.errors.exception (node:internal/deps/undici/undici:4282:14)
    at webidl.errors.invalidArgument (node:internal/deps/undici/undici:4293:28)
    at appendHeader (node:internal/deps/undici/undici:9464:29)
    at fill (node:internal/deps/undici/undici:9445:11)
    at new Request (node:internal/deps/undici/undici:10617:13)
    at getNormalizedRequestFromNodeRequest (file:///Users/morgan.walkup/Repos/frontend/node_modules/@netlify/dev/dist/main.js:205:10)
    at NetlifyDev.handleAndIntrospectNodeRequest (file:///Users/morgan.walkup/Repos/frontend/node_modules/@netlify/dev/dist/main.js:473:26)
    at async netlifyPreMiddleware (file:///Users/morgan.walkup/Repos/frontend/node_modules/@netlify/vite-plugin/dist/main.js:139:26)

Node.js v24.11.0

[morganwalkup]

@serhalp 👋 Are you the right person to take a look at this? It's a blocking issue for anyone who runs into it. I'm not sure yet if it's caused by a certain Node version, or some other shared dependency. But the fix is simple.

[serhalp]

Supersed by #534. Thank you for the PR! 🙌🏼