Drop net8.0 target framework

Author: galassie

Showcase.fsx

@@ -1,5 +1,5 @@
 #r "nuget: Spectre.Console, 0.46.0"
-#r "src/FsSpectre/bin/Debug/net8.0/FsSpectre.dll"
+#r "src/FsSpectre/bin/Debug/netstandard2.0/FsSpectre.dll"
 
 open System
 open Spectre.Console

src/FsSpectre/FsSpectre.fsproj

@@ -4,7 +4,7 @@
     <Title>FsSpectre</Title>
     <Description>Spectre.Console with with F# style.</Description>
     <!-- Build settings -->
-    <TargetFrameworks>net8.0;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0</TargetFrameworks>
     <DebugType>portable</DebugType>
     <OutputType>Library</OutputType>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>