revert the main swift version specifier back to “5.2”

WowbaggersLiquidLunch · WowbaggersLiquidLunch · commit ff3e40f3f684 · 2022-05-27T10:59:01.000+08:00
It appears that whatever caused the type checking problems before has already been fixed.
diff --git a/Package.swift b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:5.6
+// swift-tools-version:5.2
 // In order to support users running on the latest Xcodes, please ensure that
 // Package@swift-5.5.swift is kept in sync with this file.
 /*

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-// swift-tools-version:5.6`
	`1`	`+// swift-tools-version:5.2`
`2`	`2`	`// In order to support users running on the latest Xcodes, please ensure that`
`3`	`3`	`// [email protected] is kept in sync with this file.`
`4`	`4`	`/*`