Use SwiftSyntax 6.3 pre-release 2025-09-15

[SimplyDanny]

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[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.

	18 Messages
📖	Building this branch resulted in a binary size of 26133.02 KiB vs 25989.35 KiB when built on main (0% larger).
📖	Linting Aerial with this PR took 0.78 s vs 0.79 s on main (1% faster).
📖	Linting Alamofire with this PR took 0.99 s vs 0.99 s on main (0% slower).
📖	Linting Brave with this PR took 6.76 s vs 6.71 s on main (0% slower).
📖	Linting DuckDuckGo with this PR took 20.49 s vs 20.37 s on main (0% slower).
📖	Linting Firefox with this PR took 10.61 s vs 10.5 s on main (1% slower).
📖	Linting Kickstarter with this PR took 7.57 s vs 7.47 s on main (1% slower).
📖	Linting Moya with this PR took 0.42 s vs 0.42 s on main (0% slower).
📖	Linting NetNewsWire with this PR took 2.35 s vs 2.3 s on main (2% slower).
📖	Linting Nimble with this PR took 0.63 s vs 0.61 s on main (3% slower).
📖	Linting PocketCasts with this PR took 7.03 s vs 7.03 s on main (0% slower).
📖	Linting Quick with this PR took 0.42 s vs 0.38 s on main (10% slower).
📖	Linting Realm with this PR took 3.31 s vs 3.27 s on main (1% slower).
📖	Linting Sourcery with this PR took 1.8 s vs 1.79 s on main (0% slower).
📖	Linting Swift with this PR took 4.09 s vs 4.03 s on main (1% slower).
📖	Linting VLC with this PR took 1.1 s vs 1.1 s on main (0% slower).
📖	Linting Wire with this PR took 17.05 s vs 16.87 s on main (1% slower).
📖	Linting WordPress with this PR took 11.15 s vs 11.06 s on main (0% slower).

Here's an example of your CHANGELOG entry:

* Use SwiftSyntax 6.3 pre-release 2025-09-15.  
  [SimplyDanny](https://github.com/SimplyDanny)
  [#issue_number](https://github.com/realm/SwiftLint/issues/issue_number)

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