Updating MSRV in CI

Author: ecton

.github/workflows/rust.yml

@@ -7,7 +7,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: ["stable", "1.80.0"]
+        version: ["stable", "1.81.0"]
         os: ["ubuntu-22.04", "windows-latest", "macos-latest"]
     runs-on: ${{ matrix.os }}
     steps: