bump rust-version to 1.81

Author: cat-in-136

.github/workflows/rust.yml

@@ -15,7 +15,7 @@ jobs:
       uses: esp-rs/[email protected]
       with:
         default: true
-        version: "1.80.0"
+        version: "1.81.0"
         ldproxy: true
     - uses: actions/checkout@v4
       with:

Cargo.toml

@@ -10,6 +10,7 @@ homepage = "https://github.com/cat-in-136/ws2812-esp32-rmt-smart-leds"
 readme = "README.md"
 repository = "https://github.com/cat-in-136/ws2812-esp32-rmt-smart-leds"
 edition = "2021"
+rust-version = "1.81"
 
 [dependencies]
 smart-leds-trait = { version = "0.3", optional = true }