updates php/peachpie to the latest version (#6287)

frameworks/PHP/peachpie/Server/Server.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>net50</TargetFramework>
     <OutputType>Exe</OutputType>
   </PropertyGroup>
 

frameworks/PHP/peachpie/global.json

@@ -1,5 +1,5 @@
 {
     "msbuild-sdks": {
-        "Peachpie.NET.Sdk": "1.0.0-appv4128"
+        "Peachpie.NET.Sdk": "1.0.0-preview5"
     }
 }