MSRV is broken in 0.12?

[RazrFalcon]

I'm targeting 1.51.0 and getting:

error[E0277]: `[u8; 3]` is not an iterator
   --> /home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/gif-0.12.0/src/common.rs:241:41
    |
241 |         let palette = colors_vec.iter().flat_map(|&(r, g, b, _a)| [r, g, b]).collect();
    |                                         ^^^^^^^^ borrow the array with `&` or call `.iter()` on it to iterate over it
    |
    = help: the trait `Iterator` is not implemented for `[u8; 3]`
    = note: arrays are not iterators, but slices like the following are: `&[1, 2, 3]`
    = note: required because of the requirements on the impl of `IntoIterator` for `[u8; 3]`

error[E05[99](https://github.com/RazrFalcon/resvg/actions/runs/3509130848/jobs/5878016472#step:4:100)]: the method `collect` exists for struct `FlatMap<std::slice::Iter<'_, (u8, u8, u8, u8)>, [u8; 3], [closure@/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/gif-0.12.0/src/common.rs:241:50: 241:76]>`, but its trait bounds were not satisfied
   --> /home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/gif-0.12.0/src/common.rs:241:78
    |
241 |           let palette = colors_vec.iter().flat_map(|&(r, g, b, _a)| [r, g, b]).collect();
    |                                                                                ^^^^^^^ method cannot be called on `FlatMap<std::slice::Iter<'_, (u8, u8, u8, u8)>, [u8; 3], [closure@/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/gif-0.12.0/src/common.rs:241:50: 241:76]>` due to unsatisfied trait bounds
    |
    = note: the following trait bounds were not satisfied:
            `[u8; 3]: IntoIterator`
            which is required by `FlatMap<std::slice::Iter<'_, (u8, u8, u8, u8)>, [u8; 3], [closure@/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/gif-0.12.0/src/common.rs:241:50: 241:76]>: Iterator`
            `FlatMap<std::slice::Iter<'_, (u8, u8, u8, u8)>, [u8; 3], [closure@/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/gif-0.12.0/src/common.rs:241:50: 241:76]>: Iterator`
            which is required by `&mut FlatMap<std::slice::Iter<'_, (u8, u8, u8, u8)>, [u8; 3], [closure@/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/gif-0.12.0/src/common.rs:241:50: 241:76]>: Iterator`

According to this repo CI is seems like you're targeting 1.34.2, but the check doesn't work or something.

It seems like you're using 1.53.0 feature.

[HeroicKatora]

I would have assumed us to be targetting 1.61 already, but CI should be investigated regardless. It's truly puzzling. The toolchain job reports setting 1.34.2 as the default and then it doesn't end up getting used? That's strange.