Pin GitHub Action rust version to 1.69.0

This adds a step in the node setup to install our expected version of
the rust toolchain.

Signed-off-by: Sean McGinnis <stmcg@amazon.com>

.github/actions/setup-node/action.yml

@@ -34,6 +34,12 @@ runs:
           tools/.crates2.json
           tools/target
         key: ${{ hashFiles('.github/workflows/cache.yml') }}-${{ runner.os }}-${{ env.OS_ARCH }}-${{ hashFiles('tools/Cargo.lock') }}
+    - name: Setup pinned rust version
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: 1.69.0
+        override: true
+        components: rustfmt, clippy
     - run: cargo install --locked --version 0.36.0 cargo-make
       shell: bash
     - run: cargo install --locked --version 0.6.2 cargo-sweep