Fixes #5297

fix: Allow position-sensitive flags

chore(ci): Speed up critical path of CI

We've decided to try using some of our funding to speed up CI.
kbknapp has experience with build...

The goal is to allow getting the position of repeated flags for #5287

Correct safety docs

Skip nosort option below bash 4.4

chore(deps): update actions/setup-python action to v5

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perf: avoid retrieving possible_values unless they're used

In some sophisticated situations, these may be expensive to calculate.
One example might be a '-...

docs: Include more content on docs.rs

feat: Add Command::mut_group

proc-macro2 bump to 1.0.69 to fix unknown feature proc_macro_span_shrink

Fixes #5038

chore(config): migrate renovate config

docs: Link out to the changelog at the relevant tag

This was inspired by #4254

docs(derive): Link to tutorial sections for attributes

This is part of #5199

fix(help): Hide subcommands in flattened usage

fix(help): Use right about when flattening

Fixes #5226

Update command.rs

Correct wording.

feat(help): Opt-in to flatten subcommands into parent command help

When using globals, people tend to make all of the top-level arguments
global and cascading them...

refavtor: Prepare for help flattening

refactor(help): Clean up the usage code

docs(ref): Be clear about implicit ArgGroup behavior

https://github.com/dtolnay/proc-macro2/issues/398

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