Merge pull request #24 from vdice/chore/bump-spin-and-wasmtime

chore(Cargo.toml): bump spin to v2.6.0 and wasmtime to 21.0.1; update usage

Author: vdice

.github/workflows/build.yaml

@@ -26,7 +26,7 @@ jobs:
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: 1.74
+          toolchain: 1.76
 
       - name: Install dependencies
         run: |
@@ -63,7 +63,7 @@ jobs:
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: 1.74
+          toolchain: 1.76
           targets: ${{ matrix.config.target }}
       - name: Install Spin
         uses: rajatjindal/setup-actions/spin@main