Use async/await for URL session

[SimplyDanny]

No description provided.

[SwiftLintBot]

	1 Warning
⚠️	If this is a user-facing change, please include a CHANGELOG entry to credit yourself! You can find it at CHANGELOG.md.

	17 Messages
📖	Linting Aerial with this PR took 0.92s vs 0.92s on main (0% slower)
📖	Linting Alamofire with this PR took 1.27s vs 1.26s on main (0% slower)
📖	Linting Brave with this PR took 7.17s vs 7.2s on main (0% faster)
📖	Linting DuckDuckGo with this PR took 4.96s vs 4.98s on main (0% faster)
📖	Linting Firefox with this PR took 10.23s vs 10.26s on main (0% faster)
📖	Linting Kickstarter with this PR took 9.63s vs 9.65s on main (0% faster)
📖	Linting Moya with this PR took 0.53s vs 0.53s on main (0% slower)
📖	Linting NetNewsWire with this PR took 2.63s vs 2.62s on main (0% slower)
📖	Linting Nimble with this PR took 0.77s vs 0.77s on main (0% slower)
📖	Linting PocketCasts with this PR took 8.26s vs 8.21s on main (0% slower)
📖	Linting Quick with this PR took 0.44s vs 0.45s on main (2% faster)
📖	Linting Realm with this PR took 4.52s vs 4.51s on main (0% slower)
📖	Linting Sourcery with this PR took 2.29s vs 2.3s on main (0% faster)
📖	Linting Swift with this PR took 4.48s vs 4.49s on main (0% faster)
📖	Linting VLC with this PR took 1.26s vs 1.25s on main (0% slower)
📖	Linting Wire with this PR took 17.87s vs 17.85s on main (0% slower)
📖	Linting WordPress with this PR took 11.54s vs 11.54s on main (0% slower)

Here's an example of your CHANGELOG entry:

* Use async/await for URL session.  
  [SimplyDanny](https://github.com/SimplyDanny)
  [#issue_number](https://github.com/realm/SwiftLint/issues/issue_number)

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