Revert alloc::format import

The intended approach is to use `serde-serialize-no-std` if serde is needed in `no_std` environments.

Author: Jondolf

src/base/vec_storage.rs

@@ -8,8 +8,6 @@ use crate::base::dimension::{Dim, DimName, Dyn, U1};
 use crate::base::storage::{IsContiguous, Owned, RawStorage, RawStorageMut, ReshapableStorage};
 use crate::base::{Scalar, Vector};
 
-#[cfg(feature = "serde-serialize-no-std")]
-use alloc::format;
 #[cfg(feature = "serde-serialize-no-std")]
 use serde::{
     de::{Deserialize, Deserializer, Error},