Update toolchain and doc for 6.2 (#564)

In preparation for the 2.0.0 GA release,

- Update `.swift-version`, `Package.swift` and all examples'
`package.swift` to Swift 6.2
- Update all references to `2.0.0-beta.3` to `2.0.0`. This includes the
doc and readme, but also the dependencies in the examples
`Package.swift`. This will temporary break the build of the examples,
until we tag v2.0.0. Note the CI will not be affected as its consumes
the local version of the library
- [CI] Use Swift-6.2-noble for all testing tasks
- Reinstate the script to generate the contributors list and update the
list

Examples/Tutorial/Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 6.0
+// swift-tools-version: 6.2
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
@@ -9,7 +9,7 @@ let package = Package(
     name: "Palindrome",
     platforms: [.macOS(.v15)],
     dependencies: [
-        .package(url: "https://github.com/swift-server/swift-aws-lambda-runtime.git", from: "2.0.0-beta.1")
+        .package(url: "https://github.com/swift-server/swift-aws-lambda-runtime.git", from: "2.0.0")
     ],
     targets: [
         // Targets are the basic building blocks of a package, defining a module or a test suite.