fix: added rust-src to check-migrations

Author: bkontur

.github/workflows/check-migrations.yml

@@ -58,6 +58,9 @@ jobs:
       - name: Add wasm32-unknown-unknown target
         run: rustup target add wasm32-unknown-unknown
 
+      - name: Add rust-src component
+        run: rustup component add rust-src
+
       - name: Build ${{ matrix.runtime.name }}
         run: |
           cargo build --profile production -p ${{ matrix.runtime.package }} --features try-runtime -q --locked