feat: add bluesky data field for conferences

[JoshuaKGoldberg]

Thanks for creating a new Pull Request for this repository.

To get the conference as fast as possible into confs.tech please consider the following things.

Checklist for your change

• does not delete another conference
• has passed the tests via npm run test
• has the correct order via npm run reorder-confs
• is a developer conference: more than 3-4 people from different companies
• is not a webinar, hackathon, marketing, zoom meeting with one person
• URLs are reachable, as short as possible, do not contain tracking parameters and the website is dedicated for this event
• topic is correct
• conference name is as short as possible and does not include location and date

(this isn't adding a conf, but hey - it still passes the checklist anyway!)

---

Fixes #7509 on this repo's end. I'll send separate PRs for the other repos too.

Just pipes the data through without adding any validations. I considered adding one to script/utils/checkConference.ts but 🤷 I'm not positive on the right way to validate a bsky handle.

[cgrail]

Looks good. Did you also change the order in the other stacks?

[JoshuaKGoldberg]

Wow you reviewed this fast 😄 I got up from the computer, made a latte, and it was merged. I haven't done anything yet. Working on it now!