Update setup-swift to 1.15.0

[file-sync-app]

Synced local file(s) with Nef10/common-swift-package.

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This PR was created automatically by the repo-file-sync-action workflow run #2285435652

[github-actions]

Coverage after merging repo-sync/common-swift-package/default into main

1.89%

Coverage Report

File	Stmts	Funcs	Lines	Uncovered Lines
Sources/Wealthsimple
Token.swift	0%	0%	0%	100–104, 111–124, 132–166, 168–191, 193–197, 199–205, 207–209, 211–219, 221–225, 47–52, 54–66, 68–79, 81–99
TransactionError.swift	0%	0%	0%	29–46
WealthsimpleAccount.swift	0%	0%	0%	100–112, 114–155, 80–95, 97–99
WealthsimpleAsset.swift	0%	0%	0%	52–68
WealthsimpleDownloader.swift	0%	0%	0%	104–117, 124–137, 139–151, 48–51, 55–80, 84–97
WealthsimplePosition.swift	0%	0%	0%	100–117, 119–160, 53–57, 66–92, 94–99
WealthsimpleTransaction.swift	0%	0%	0%	117–121, 140–184, 186–211, 213–254
Sources/Wealthsimple/Extensions
String+CamelCase.swift	100%	100%	100%