2238: cargo: use resolver 2 r=MarinPostma a=happysalada

# Pull Request

## What does this PR do?
use resolver 2 from cargo.
This enables mainly to propagate the `--no-default-features` flag to workspace crates.
I mistakenly thought before that it was enough to have edition 2021 enabled. However it turns out that for virtual workspaces, this needs to be explicitely defined.
https://doc.rust-lang.org/edition-guide/rust-2021/default-cargo-resolver.html

This will also change a little how your dependencies are compiled. See https://blog.rust-lang.org/2021/03/25/Rust-1.51.0.html#cargos-new-feature-resolver for more details.

Just to give a bit more context, this is for usage in nixos. I have tried to do the upgrade today with the latest version, and the no default features flag is just ignored.

Let me know if you need more details of course.


## PR checklist
Please check if your PR fulfills the following requirements:
- [ ] Does this PR fix an existing issue?
- [ ] Have you read the contributing guidelines?
- [ ] Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!


Co-authored-by: happysalada <raphael@megzari.com>
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bors[bot] 2022-03-15 15:50:16 +00:00 committed by GitHub
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@ -1,4 +1,5 @@
[workspace]
resolver = "2"
members = [
"meilisearch-http",
"meilisearch-error",