chore: Bump Rust toolchain to 1.81.0 (#452)

Author: Techassi

config/versions.yaml

@@ -2,7 +2,7 @@
 # IMPORTANT
 # If you change the Rust toolchain version here, make sure to also change
 # docker-images/ubi8-rust-builder/Dockerfile & docker-images/ubi9-rust-builder/Dockerfile
-rust_version: 1.80.1
+rust_version: 1.81.0
 
 # IMPORTANT
 # If you change the Hadolint version here, make sure to also change the hook