🎈 Add Minecraft pc 1.21.9 data

[rom1504bot]

This automated PR sets up the relevant boilerplate for Minecraft pc version 1.21.9. Fixes #1095.

Related:

• Issue: Support Minecraft PC 1.21.9 #1095
• Protocol Version: 773
• 🎈 Add version 1.21.9 minecraft-data-generator#58

• You can help contribute to this PR by opening a PR against this pc-1_21_9 branch instead of master.

[richnetdesign]

I can't reproduce this error when running cd tools/js && npm test locally from this branch. Also my # of tests run don't match the github actions output.

Locally I get

1663 passing (1m)
1 pending

Github says

1690 passing (2m)
1 pending
1 failing

1. protocol yaml
   should be valid and in sync with json:
   Error: 1.21.8 (1.21.8) / protocol.json is desynced from yaml, please run 'npm run build'

I could use some advice on how to ensure my local environment testing matches the CI/CD

[extremeheat]

Your local branch is out of date, it's not listing all the tests (1663 vs 1690). I just merged master into here, pull the latest commit and run it again

[richnetdesign]

Ok thanks. I regenerated the json and it found .8 and .9 were out of sync. I can submit a PR to fix.

It looks like the bot changed the .8 proto.yaml in this branch even though this PR is for .9. Is that correct?

This bot updates to .8 are here.
dd11e71

PR to fix is here
#1117

[extremeheat]

Protocol data is not correct https://github.com/PrismarineJS/mineflayer/actions/runs/19987084418/job/57322609224?pr=3754