Ensure building with serde-big-array 0.4.1 works (#34)

Author: cecton

.github/workflows/rust.yml

@@ -49,6 +49,10 @@ jobs:
 
       - uses: Swatinem/rust-cache@v2
 
+      - name: Set serde-big-array to minimum version (0.4.1)
+        if: matrix.rust == 'msrv'
+        run: cargo update -p serde-big-array --precise 0.4.1
+
       - name: cargo test
         run: cargo test --workspace ${{ matrix.rust-args }}