Convert SPI documentation links to not be version specific. (#365)

Author: daveverwer

_posts/2023-08-17-sswg-update-2023.md

@@ -59,7 +59,7 @@ Additionally, SSWG member Gwynne [merged a PR for Swift 5.9](https://github.com/
 The SSWG has continued to work with the community to increase adoption of Swift on the server:
 
 * The SSWG Guides and incubation processes have been migrated to [Swift.org](http://Swift.org) to make them more discoverable.
-* [Many](https://swiftpackageindex.com/swift-server/async-http-client/1.18.0/documentation/asynchttpclient) [of](https://swiftpackageindex.com/swift-server/RediStack/1.5.1/documentation/redistack) [the](https://swiftpackageindex.com/apple/swift-nio/2.58.0/documentation/nio) [Swift](https://swiftpackageindex.com/apple/swift-log/1.5.2/documentation/logging) [server](https://swiftpackageindex.com/apple/swift-metrics/2.4.1/documentation/coremetrics) [packages](https://swiftpackageindex.com/swift-server/swift-aws-lambda-runtime/1.0.0-alpha.1/documentation/awslambdaruntime) have adopted Swift Package Index documentation hosting to make discovering and using packages easier.
+* [Many](https://swiftpackageindex.com/swift-server/async-http-client/documentation/asynchttpclient) [of](https://swiftpackageindex.com/swift-server/RediStack/documentation/redistack) [the](https://swiftpackageindex.com/apple/swift-nio/documentation/nio) [Swift](https://swiftpackageindex.com/apple/swift-log/documentation/logging) [server](https://swiftpackageindex.com/apple/swift-metrics/documentation/coremetrics) [packages](https://swiftpackageindex.com/swift-server/swift-aws-lambda-runtime/documentation/awslambdaruntime) have adopted Swift Package Index documentation hosting to make discovering and using packages easier.
 * The SSWG has created a survey to better understand the Swift on server community and help ensure efforts are applied to the right areas.
 * We are observing an increase in the number of conference talks focused on production success stories and technical deep dives, reflecting a maturity in adoption and recognition of Swift on server.