Un-pin fd-lock version

[notmandatory]

Description

MSRV issue with fd-lock 3.0.1 was fixed with version 3.0.2. See: https://github.com/yoshuawuyts/fd-lock/issues/16

But now I had to limit the rustyline version to <9.1.0 because that version upgrades to rust edition 2021 which we haven't adopted yet and would change our MSRV to 1.56.0.

Checklists

All Submissions:

• [x] I've signed all my commits
• [x] I followed the contribution guidelines
• [x] I ran cargo fmt and cargo clippy before committing

[notmandatory]

rebased.