update nuget.exe to latest and fix nuspec specification of readme

Oqtane.Package/Oqtane.Client.nuspec

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
+<package>
   <metadata>
     <id>Oqtane.Client</id>
     <version>5.2.2</version>
@@ -21,5 +21,6 @@
     <file src="..\Oqtane.Client\bin\Release\net8.0\Oqtane.Client.dll" target="lib\net8.0" /> 
     <file src="..\Oqtane.Client\bin\Release\net8.0\Oqtane.Client.pdb" target="lib\net8.0" /> 
     <file src="icon.png" target="" />
+    <file src="readme.md" target="" />
   </files>
 </package>

Oqtane.Package/Oqtane.Framework.nuspec

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
+<package>
   <metadata>
     <id>Oqtane.Framework</id>
     <version>5.2.2</version>
@@ -19,5 +19,6 @@
   </metadata>
   <files>
     <file src="icon.png" target="" />
+    <file src="readme.md" target="" />
   </files>
 </package>

Oqtane.Package/Oqtane.Server.nuspec

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
+<package>
   <metadata>
     <id>Oqtane.Server</id>
     <version>5.2.2</version>
@@ -21,5 +21,6 @@
     <file src="..\Oqtane.Server\bin\Release\net8.0\Oqtane.Server.dll" target="lib\net8.0" /> 
     <file src="..\Oqtane.Server\bin\Release\net8.0\Oqtane.Server.pdb" target="lib\net8.0" /> 
     <file src="icon.png" target="" />
+    <file src="readme.md" target="" />
   </files>
 </package>

Oqtane.Package/Oqtane.Shared.nuspec

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
+<package>
   <metadata>
     <id>Oqtane.Shared</id>
     <version>5.2.2</version>
@@ -21,5 +21,6 @@
     <file src="..\Oqtane.Shared\bin\Release\net8.0\Oqtane.Shared.dll" target="lib\net8.0" /> 
     <file src="..\Oqtane.Shared\bin\Release\net8.0\Oqtane.Shared.pdb" target="lib\net8.0" /> 
     <file src="icon.png" target="" />
+    <file src="readme.md" target="" />
   </files>
 </package>

Oqtane.Package/Oqtane.Updater.nuspec

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
+<package>
   <metadata>
     <id>Oqtane.Updater</id>
     <version>5.2.2</version>
@@ -20,5 +20,6 @@
   <files>
     <file src="..\Oqtane.Updater\bin\Release\net8.0\publish\*.*" target="lib\net8.0" /> 
     <file src="icon.png" target="" />
+    <file src="readme.md" target="" />
   </files>
 </package>