Fix installing firefox in browser tests

[ensi321]

Describe the bug

Current browser tests CI installs Firefox by running

lodestar/.github/workflows/test.yml

Line 181 in 3f3c7fc

run: npx @puppeteer/browsers install firefox@latest --path /tmp

However it attempts to download a browser by pointing to an url that no longer exists:

Run npx @puppeteer/browsers install firefox@latest --path /tmp
@puppeteer/browsers install <browser>

Download and install the specified browser. If successful, the command outputs the actual browser buildId that was installed and the absolute path to the browser executable (format: <browser>@<buildID> <path>).
...
Error: Download failed: server returned code 404. URL: https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central/firefox-135.0a1.en-US.linux-x86_64.tar.bz2
    at /home/runner/actions-runner/_work/lodestar/lodestar/node_modules/@puppeteer/browsers/lib/cjs/httpUtil.js:95:31
    at ClientRequest.requestCallback (/home/runner/actions-runner/_work/lodestar/lodestar/node_modules/@puppeteer/browsers/lib/cjs/httpUtil.js:72:13)
    at Object.onceWrapper (node:events:635:26)
    at ClientRequest.emit (node:events:520:28)
    at HTTPParser.parserOnIncomingClient [as onIncoming] (node:_http_client:700:27)
    at HTTPParser.parserOnHeadersComplete (node:_http_common:119:17)
    at TLSSocket.socketOnData (node:_http_client:542:22)
    at TLSSocket.emit (node:events:520:28)
    at addChunk (node:internal/streams/readable:559:12)
    at readableAddChunkPushByteMode (node:internal/streams/readable:510:3)
Error: Process completed with exit code 1.

Hence failing the entire browser tests

Expected behavior

Successfully pass the browser tests

Steps to reproduce

No response

Additional context

No response

Operating system

Linux

Lodestar version or commit hash

v1.24.0