adds cfp info for Oct. 15 issue (rust-lang#7146)

Signed-off-by: Nell Shamrell <[email protected]>

Author: nellshamrell

draft/2025-10-15-this-week-in-rust.md

@@ -139,6 +139,8 @@ 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.* -->
 
+* [**TokioConf 2026**](https://tokio.rs/blog/2025-09-26-announcing-tokio-conf-cfp)| CFP closes 2025-12-08 | Portland, Oregon, USA | 2026-04-20
+
 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)!
 
 ## Updates from the Rust Project