Update Rust toolchain version to 1.80.0 in CI workflow (#741)

* Update Rust toolchain version to 1.80.0 in CI workflow

* Update Rust toolchain version to 1.81 in CI workflow

Author: lennartdohmann

.github/workflows/ci-rust-gscan-cli.yaml

@@ -42,7 +42,7 @@ jobs:
         with:
           SRC_DIR: rust/examples/gscan
           RUSTTARGET: x86_64-pc-windows-gnu
-          TOOLCHAIN_VERSION: 1.80
+          TOOLCHAIN_VERSION: 1.81
           EXTRA_FILES: "Readme.md"
           UPLOAD_MODE: none