Match CI toolchain with rust-toolchain

.github/workflows/ci.yml

@@ -27,8 +27,17 @@ jobs:
           node-version: ${{ matrix.node }}
           registry-url: "https://registry.npmjs.org"
 
-      - name: Install 1.63.x Rust toolchain
-        uses: dtolnay/rust-toolchain@1.63
+      - name: Read rust-toolchain file from repository
+        id: gettoolchain
+        run: echo "::set-output name=toolchain::$(cat rust-toolchain)"
+        working-directory: ${{ matrix.node }}/${{ matrix.flavor }}
+
+      - name: Install ${{ steps.gettoolchain.outputs.toolchain }} Rust toolchain
+        # Latest version available on this commit is 1.71.1
+        # Commit date is Aug 3, 2023
+        uses: dtolnay/rust-toolchain@f361669954a8ecfc00a3443f35f9ac8e610ffc06
+        with:
+          toolchain: ${{ steps.gettoolchain.outputs.toolchain }}
 
       - name: Install
         if: ${{ matrix.flavor == 'dev'}}