bump msrv to 1.81.0

Author: KodrAus

.github/workflows/ci.yml

@@ -88,10 +88,10 @@ jobs:
       uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
 
     - name: Install Rust toolchain
-      run: rustup update 1.63.0
+      run: rustup update 1.81.0
 
     - name: Version features
-      run: cargo +1.63.0 build --manifest-path tests/smoke-test/Cargo.toml
+      run: cargo +1.81.0 build --manifest-path tests/smoke-test/Cargo.toml
 
   examples:
     name: Tests / Examples

Cargo.toml

@@ -30,7 +30,7 @@ name = "uuid"
 readme = "README.md"
 repository = "https://github.com/uuid-rs/uuid"
 version = "1.20.0" # remember to update html_root_url in lib.rs
-rust-version = "1.63.0"
+rust-version = "1.81.0"
 
 [package.metadata.docs.rs]
 rustc-args = ["--cfg", "uuid_unstable"]