Update MSRV to 1.63

[jayvdb]

Here is the reason for MSRV being bumped

warning: current MSRV (Minimum Supported Rust Version) is `1.56.0` but this item is stable since `1.63.0`
 --> fake/src/impls/std/array.rs:9:9
  |
9 |         std::array::from_fn(|_| Fake::fake_with_rng::<T, _>(config, rng))
  |         ^^^^^^^^^^^^^^^^^^^
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv
  = note: `#[warn(clippy::incompatible_msrv)]` on by default

[llogiq]

Thank you! That one's a no-brainer.