ci: Bump nightly Rust version to nightly-2026-07-01

Author: Techassi

.github/workflows/pr_prek.yaml

@@ -7,7 +7,7 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
-  RUST_TOOLCHAIN_VERSION: "nightly-2026-02-24"
+  RUST_TOOLCHAIN_VERSION: "nightly-2026-07-01"
 
 permissions: {}