remove spurious CfT line "No calls for testing were issued this week." (#5492)

Author: U007D

content/2024-05-08-this-week-in-rust.md

@@ -92,8 +92,6 @@ An important step for RFC implementation is for people to experiment with the
 implementation and give feedback, especially before stabilization.  The following
 RFCs would benefit from user testing before moving forward:
 
-* *No calls for testing were issued this week.*
-
 ### [RFCs](https://github.com/rust-lang/rfcs/issues?q=label%3Acall-for-testing)
 * [RFC: Make Cargo respect minimum supported Rust version (MSRV) when selecting dependencies](https://github.com/rust-lang/rfcs/pull/3537)
   * [Testing steps](https://github.com/rust-lang/cargo/issues/13873)