fix(build.yaml): bump rust to 1.81 (#22)

Signed-off-by: Vaughn Dice <vaughn.dice@fermyon.com>

Author: vdice

.github/workflows/build.yml

@@ -30,7 +30,7 @@ jobs:
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: 1.66
+          toolchain: 1.81
           targets: ${{ matrix.config.target }}
       - name: Set up for cross-compiled linux aarch64 build
         if: matrix.config.target == 'aarch64-unknown-linux-gnu'