net8 compatibility

0-source/Directory.Build.props

@@ -3,6 +3,7 @@
   <Import Project="../Directory.Build.props" />
 
   <PropertyGroup>
+    <TargetFrameworks>net8.0;net10.0</TargetFrameworks>
     <IsPackable>true</IsPackable>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <VersionPrefix>0.1.0</VersionPrefix>

0-source/Just.PreciseMath/packages.lock.json

@@ -1,6 +1,7 @@
 {
   "version": 1,
   "dependencies": {
-    "net10.0": {}
+    "net10.0": {},
+    "net8.0": {}
   }
 }