Update to the latest Substrate commit

Enables building with only the stable toolchain. The nightly toolchain is still
used for clippy in order to access additional checks.

.github/actions/build-dependencies/action.yml

@@ -37,16 +37,6 @@ runs:
       with:
         toolchain: ${{ inputs.rust-toolchain }}
         components: ${{ inputs.rust-components }}
-
-    - name: Get nightly version to use
-      id: nightly
-      shell: bash
-      run: echo "version=$(cat .github/nightly-version)" >> $GITHUB_OUTPUT
-
-    - name: Install WASM toolchain
-      uses: dtolnay/rust-toolchain@master
-      with:
-        toolchain: ${{ steps.nightly.outputs.version }}
         targets: wasm32-unknown-unknown
 
     - name: Cache Rust