Use `slice::iter` instead of `into_iter` to avoid future breakage

[LukasKalbertodt]

an_array.into_iter() currently just works because of the autoref feature, which then calls <[T] as IntoIterator>::into_iter. But in the future, arrays will implement IntoIterator, too. In order to avoid problems in the future, the call is replaced by iter() which is shorter and more explicit.

A crater run showed that your crate is affected by a potential future change. See https://github.com/rust-lang/rust/pull/65819 for more information.

[codecov[bot]]

Codecov Report

Merging #7 into master will decrease coverage by 0.03%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #7      +/-   ##
==========================================
- Coverage   99.41%   99.37%   -0.04%     
==========================================
  Files          27       27              
  Lines        5157     5159       +2     
==========================================
  Hits         5127     5127              
- Misses         30       32       +2

Flag	Coverage Δ
#unittests	99.32% <100%> (-0.04%)	:arrow_down:
#whitebox_unitttests	84% <ø> (+12%)	:arrow_up:

Impacted Files	Coverage Δ
src/internet/ipv4.rs	100% <100%> (+0.3%)	:arrow_up:
src/internet/ipv6.rs	98.98% <0%> (-1.02%)	:arrow_down:
src/packet_builder.rs	98.31% <0%> (-0.84%)	:arrow_down:
tests/unit-tests.rs	98.43% <0%> (-0.05%)	:arrow_down:
tests/packet_compositions/mod.rs	97.5% <0%> (ø)	:arrow_up:
src/transport/tcp.rs	99.82% <0%> (+0.17%)	:arrow_up:

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[JulianSchmid]

Cool thanks. I will release this in a patch release of the create.