Fix feature combinations in testing

[iawia002]

I reencountered the issue of feature combinations in this CI, similar to #8997:

error[E0277]: the trait bound `cranelift_codegen::ir::GlobalValue: Serialize` is not satisfied
    --> cranelift/wasm/src/heap.rs:67:12
     |
67   |     derive(serde_derive::Serialize, serde_derive::Deserialize)
     |            ^^^^^^^^^^^^^^^^^^^^^^^ the trait `Serialize` is not implemented for `cranelift_codegen::ir::GlobalValue`

cc @alexcrichton

[alexcrichton]

Thanks!