bump to swift 6

Author: CamJN

.github/workflows/swift.yml

@@ -33,7 +33,8 @@ jobs:
         fetch-depth: 0 # until https://github.com/actions/checkout/issues/1471 fixed
     - uses: swift-actions/setup-swift@v2
       with:
-        swift-version: '5.10'
+        swift-version: '6.0'
+        # https://www.swift.org/download/
     - name: Build
       run: swift build -v
       working-directory: getargv-swift

.spi.yml

@@ -3,4 +3,4 @@ builder:
   configs:
     - documentation_targets: [ SwiftGetargv, Cgetargv ]
       platform: macosSpm
-      swift_version: '5.10'
+      swift_version: '6.0'

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.10
+// swift-tools-version:6.0
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription