Replace acid_io by core2

[Mathieu-Lala]

Hello 👋

This advisory has been bothering me since a while.
The origin of it is acid_io, where the issue has been fixed, but no release has been publish 😞 (since 3 years!)

So, after reading this discussion/issue, I decided to replace acid_io for core2 (which seems quite used, even if the last release was 2 years ago).

The changes was trivial as acid_io and core2::io have the same API as std::io. But, while trying to test those changes, the CI failed (which was also the case last week). So I started to fix the CI, and made changes to make the CI pass.

I also added a dependabot.yaml, PR will be created monthly to update the dependencies in the Cargo.toml and ci.yml.

I formatted the README.md and Cargo.toml.

I had to bump MSRV to 1.65.

I bumped the dependencies to their latest versions, and pushed the Cargo.lock, see why.

And I ran cargo clippy --fix and cargo fmt, with not much modification from myself.

I just finished to write the description of this PR and realize that someone was working on #36, oops

[duesee]

I just finished to write the description of this PR and realize that someone was working on #36, oops

Don't worry! As far as I remember, I wasn"t sure how to proceed with the PR. If you know how, please feel free to take anything you need from it (or not :-)). Can also be closed should it be/get outdated. Not much time to work on it currently :-(

[Mathieu-Lala]

close #37

[Mathieu-Lala]

I managed to make all the CI job pass, i also added a docs and spellcheck jobs.

Feel free to edit/push on this branch if you are not satisfied with some changes

[dequbed]

Thanks @Mathieu-Lala for this PR!
I'm not perfectly clear if the lifetimes chances are correct (in the correctness despite unsafe meaning), but given they (seem to) fix #41 I'm going to merge this first and add some tests later making sure they also keep API for semver. :)