update some social media links (#7138)

Tracks the changes made in other locations in #6540.

Author: ericseppanen

draft/DRAFT_TEMPLATE

@@ -122,7 +122,7 @@ Some of these tasks may also have mentors available, visit the task page for mor
 <!-- * [ - ]() -->
 <!-- or if none - *No Calls for participation were submitted this week.* -->
 
-If you are a Rust project owner and are looking for contributors, please submit tasks [here][guidelines] or through a [PR to TWiR](https://github.com/rust-lang/this-week-in-rust) or by reaching out on [X (formerly Twitter)](https://x.com/ThisWeekInRust) or [Mastodon](https://mastodon.social/@thisweekinrust)!
+If you are a Rust project owner and are looking for contributors, please submit tasks [here][guidelines] or through a [PR to TWiR](https://github.com/rust-lang/this-week-in-rust) or by reaching out on [Bluesky](https://bsky.app/profile/thisweekinrust.bsky.social) or [Mastodon](https://mastodon.social/@thisweekinrust)!
 
 [guidelines]:https://github.com/rust-lang/this-week-in-rust?tab=readme-ov-file#call-for-participation-guidelines
 
@@ -133,7 +133,7 @@ Are you a new or experienced speaker looking for a place to share something cool
 <!-- CFPs go here, use this format: * [**event name**](URL to CFP)| Date CFP closes in YYYY-MM-DD | city,state,country | Date of event in YYYY-MM-DD -->
 <!-- or if none - *No Calls for papers or presentations were submitted this week.* -->
 
-If you are an event organizer hoping to expand the reach of your event, please submit a link to the website through a [PR to TWiR](https://github.com/rust-lang/this-week-in-rust) or by reaching out on [X (formerly Twitter)](https://x.com/ThisWeekInRust) or [Mastodon](https://mastodon.social/@thisweekinrust)!
+If you are an event organizer hoping to expand the reach of your event, please submit a link to the website through a [PR to TWiR](https://github.com/rust-lang/this-week-in-rust) or by reaching out on [Bluesky](https://bsky.app/profile/thisweekinrust.bsky.social) or [Mastodon](https://mastodon.social/@thisweekinrust)!
 
 ## Updates from the Rust Project