Update cortex-m-pac/Cargo.toml

Co-authored-by: Ralph Ursprung <39383228+rursprung@users.noreply.github.com>

Author: romancardenas

cortex-m-pac/Cargo.toml

@@ -2,7 +2,7 @@
 name = "cortex-m-pac"
 version = "0.1.0"
 edition = "2021"
-rust-version = "1.60"
+rust-version = "1.81"
 repository = "https://github.com/rust-embedded/cortex-m"
 authors = ["The Cortex-M Team <cortex-m@teams.rust-embedded.org>",]
 categories = ["embedded", "hardware-support", "no-std"]