[Repo Assist] fix: dispose SHA1 instance in Caching.hashString; use SHA1.HashData on .NET 5+#1745

dsyme merged 2 commits intomainfsprojects/FSharp.Data:mainfrom

repo-assist/improve-sha1-disposal-caching-2026-04-16-f466c854a7d11c78fsprojects/FSharp.Data:repo-assist/improve-sha1-disposal-caching-2026-04-16-f466c854a7d11c78Copy head branch name to clipboard