lock toolchain to 1.65

Author: kbonnici

.github/workflows/test.yml

@@ -10,9 +10,8 @@ jobs:
 
     steps:
      - uses: actions/checkout@v3
-     - uses: dtolnay/rust-toolchain@stable
+     - uses: dtolnay/rust-toolchain@1.65
        with:
-         toolchain: 1.65
          targets: wasm32-unknown-unknown
 
      - run: rustc --version