Update strum requirement from 0.25 to 0.26

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[domenukk]

Breaking Changes
...
The Iterator struct generated by EnumIter now has new bounds on it. This shouldn't break code unless you manually added the implementation in your code.

See
https://github.com/Peternator7/strum/blob/master/CHANGELOG.md#0260

[domenukk]

The error is:

error[E0277]: the trait bound `arch::x86_64::RegsIter: std::iter::FusedIterator` is not satisfied
   --> libafl_qemu/src/arch/x86_64.rs:13:63
    |
13  | #[derive(IntoPrimitive, TryFromPrimitive, Debug, Clone, Copy, EnumIter)]
    |                                                               ^^^^^^^^
    |                                                               |
    |                                                               the trait `std::iter::FusedIterator` is not implemented for `arch::x86_64::RegsIter`
    |                                                               in this derive macro expansion
    |
   ::: /home/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/strum_macros-0.25.3/src/lib.rs:378:1
    |
378 | pub fn enum_iter(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
    | --------------------------------------------------------------------------- in this expansion of `#[derive(EnumIter)]`
    |
note: required by a bound in `strum::IntoEnumIterator::Iterator`
   --> /home/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/strum-0.26.2/src/lib.rs:105:11
    |
101 |     type Iterator: Iterator<Item = Self>
    |          -------- required by a bound in this associated type
...
105 |         + FusedIterator;
    |           ^^^^^^^^^^^^^ required by this bound in `IntoEnumIterator::Iterator`

Second error:

error[E0599]: no variant or associated item named `iter` found for enum `libafl_qemu_sys::MmapPerms` in the current scope
  --> libafl_qemu/src/lib.rs:95:30
   |
95 |     for r in sys::MmapPerms::iter() {
   |                              ^^^^ variant or associated item not found in `MmapPerms`
   |
   = help: items from traits can only be used if the trait is in scope
help: trait `IntoEnumIterator` which provides `iter` is implemented but not in scope; perhaps you want to import it
   |
31 + use strum::IntoEnumIterator;
   |

[domenukk]

@rmalmain want to take a look if that somehow works locally? (I'm on MacOS right now :D )

[rmalmain]

@domenukk should be fixed

[domenukk]

Fixed with #2173

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