Raise minimum Swift version to 5.8 (#165)

Author: glbrntt

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.7
+// swift-tools-version:5.8
 //===----------------------------------------------------------------------===//
 //
 // This source file is part of the SwiftNIO open source project

README.md

@@ -19,7 +19,7 @@ SwiftNIO SSH      | Minimum Swift Version
 `0.4.0 ..< 0.5.0` | 5.4
 `0.5.0 ..< 0.6.2` | 5.5.2
 `0.6.2 ..< 0.9.0` | 5.6
-`0.9.0 ...`       | 5.7
+`0.9.0 ...`       | 5.8
 
 ## What does SwiftNIO SSH support?
 

Sources/NIOSSH/Docs.docc/index.md

@@ -21,7 +21,7 @@ SwiftNIO SSH      | Minimum Swift Version
 `0.4.0 ..< 0.5.0` | 5.4
 `0.5.0 ..< 0.6.2` | 5.5.2
 `0.6.2 ..< 0.9.0` | 5.6
-`0.9.0 ...`       | 5.7
+`0.9.0 ...`       | 5.8
 
 ### What does SwiftNIO SSH support?
 

docker/docker-compose.2204.510.yaml

@@ -6,7 +6,8 @@ services:
     image: swift-nio-ssh:22.04-5.10
     build:
       args:
-        base_image: "swiftlang/swift:nightly-5.10-jammy"
+        ubuntu_version: "jammy"
+        swift_version: "5.10"
 
   documentation-check:
     image: swift-nio-ssh:22.04-5.10