[cargo-nextest] use stylesheets everywhere, update supports-color

[sunshowers]

This picks up an update to supports-color v3, and also uses that to determine color support everywhere. We stop using owo-colors' if_supports_color because that hasn't been updated to v3 yet.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 41.49660% with 86 lines in your changes missing coverage. Please review.

Project coverage is 79.30%. Comparing base (fa6f676) to head (78394ab). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cargo-nextest/src/errors.rs	6.45%	29 Missing :warning:
cargo-nextest/src/dispatch.rs	61.90%	24 Missing :warning:
cargo-nextest/src/output.rs	42.85%	20 Missing :warning:
cargo-nextest/src/update.rs	0.00%	8 Missing :warning:
cargo-nextest/src/main.rs	0.00%	4 Missing :warning:
cargo-nextest/src/double_spawn.rs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1699 +/- ## ========================================== + Coverage 79.23% 79.30% +0.06% ========================================== Files 79 79 Lines 19798 19802 +4 ========================================== + Hits 15687 15704 +17 + Misses 4111 4098 -13 ```

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