Remove conditional feature as it is not supported

[mircea-c]

Problem

Adding dependencies based on configuration values is currently not supported. Cargo generates an error when trying to build this crate (see #6440 (comment))

https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#platform-specific-dependencies

The same applies to cfg(debug_assertions), cfg(test) and cfg(proc_macro). These values will not work as expected and will always have the default value returned by rustc --print=cfg. There is currently no way to add dependencies based on these configuration values.

Summary of Changes

Remove condition and add feature directly to dependency.

Fixes #

[LucasSte]

The toml file needs to be sorted for CI to pass.

[mergify]

Backports to the stable branch are to be avoided unless absolutely necessary for fixing bugs, security issues, and perf regressions. Changes intended for backport should be structured such that a minimum effective diff can be committed separately from any refactoring, plumbing, cleanup, etc that are not strictly necessary to achieve the goal. Any of the latter should go only into master and ride the normal stabilization schedule.

[mergify]

Backports to the beta branch are to be avoided unless absolutely necessary for fixing bugs, security issues, and perf regressions. Changes intended for backport should be structured such that a minimum effective diff can be committed separately from any refactoring, plumbing, cleanup, etc that are not strictly necessary to achieve the goal. Any of the latter should go only into master and ride the normal stabilization schedule. Exceptions include CI/metrics changes, CLI improvements and documentation updates on a case by case basis.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.8%. Comparing base (3804f39) to head (719d2cf).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6577   +/-   ##
=======================================
  Coverage    82.8%    82.8%           
=======================================
  Files         849      849           
  Lines      379244   379244           
=======================================
+ Hits       314106   314147   +41     
+ Misses      65138    65097   -41     

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