Update 2025-12-17-this-week-in-rust.md

Add RustConf 2026 CFP

Author: ernestkissiedu

draft/2025-12-17-this-week-in-rust.md

@@ -131,6 +131,7 @@ If you are a Rust project owner and are looking for contributors, please submit
 Are you a new or experienced speaker looking for a place to share something cool? This section highlights events that are being planned and are accepting submissions to join their event as a speaker.
 
 <!-- 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 -->
+* [**RustConf 2026**](https://sessionize.com/rustconf-2026/) | 2026-02-16 | Montreal, Quebec, Canada | 2026-09-08 - 2026-09-10
 <!-- 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 [Bluesky](https://bsky.app/profile/thisweekinrust.bsky.social) or [Mastodon](https://mastodon.social/@thisweekinrust)!