os_detect: bump lints and SDK versions

[kevmoo]

...and other cleanup across the board

• drop deprecated lints
• drop redundant lints
• tiny bump to min test version using --tighten pub command

[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:characters	1.4.0	ready to publish	characters-v1.4.0
package:args	2.6.1-wip	WIP (no publish necessary)
package:async	2.12.0	already published at pub.dev
package:collection	1.19.1	already published at pub.dev
package:convert	3.1.2	already published at pub.dev
package:crypto	3.0.6	already published at pub.dev
package:fixnum	1.1.1	already published at pub.dev
package:logging	1.3.0	already published at pub.dev
package:os_detect	2.0.3-wip	WIP (no publish necessary)
package:path	1.9.1	already published at pub.dev
package:platform	3.1.6	already published at pub.dev
package:typed_data	1.4.0	already published at pub.dev

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.

[github-actions]

PR Health

Coverage ⚠️

File	Coverage
pkgs/os_detect/bin/os_detect.dart	💔 Not covered
pkgs/os_detect/lib/os_detect.dart	💚 100 %

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License Headers ✔️

// Copyright (c) 2024, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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[devoncarew]

Just curious why the increase in specificity?

[kevmoo]

It's what dart pub upgrade --tighten does 🤷