Package.swift: bump swift-tools-version to 5.5 (#362)

MaxDesiatov · web-flow · commit c33e0d07ab30 · 2022-11-07T14:39:38.000-08:00
SwiftPM already requires 5.5, but now with `Sendable` introduced on some TSC types in #361, this is unlikely to compile without errors with Swift 5.4.
diff --git a/Package.swift b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:5.4
+// swift-tools-version:5.5
 
 /*
  This source file is part of the Swift.org open source project

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-// swift-tools-version:5.4`
	`1`	`+// swift-tools-version:5.5`
`2`	`2`
`3`	`3`	`/*`
`4`	`4`	`This source file is part of the Swift.org open source project`