Ensure that the 'cmake_minimum_required' is version 3.5 or greater (#23888)

### Description
CMake 4.0 release candidate 2.0 is available, and it cannot compile all
of OnnxRuntime out-of-the-box. There's portions of the OnnxRuntime
codebase that specify a `cmake_minimum_required` version of 3.0, and
CMake 4.0 has removed support for compatibility with CMake < 3.5 - the
following error is reported:

```
CMake Error at winml_sdk_helpers.cmake:4 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.

  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.
```

Since CMake 3.5 appears to have shipped in 2016, it seems reasonable to
set that as a minimum version to fix the error. The root CMakeLists.txt
does ask for a minimum version of 3.28, so we could snap to that, but
I'm still ramping up on the build, so wanted to propose a minimally
sufficient fix.

### Motivation and Context
Being able to build with the latest CMake - when it ships - reduces the
barrier to entry to building OnnxRuntime, and allows the OnnxRuntime to
leverage the latest and greatest tooling.

Author: mschofie

cmake/nuget_helpers.cmake

@@ -1,7 +1,7 @@
 # Copyright (c) Microsoft Corporation. All rights reserved.
 # Licensed under the MIT License.
 
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.5)
 
 # Determines the version of a native nuget package from the root packages.config.
 #

cmake/winml_sdk_helpers.cmake

@@ -1,7 +1,7 @@
 # Copyright (c) Microsoft Corporation. All rights reserved.
 # Licensed under the MIT License.
 
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.5)
 
 # utility
 function(convert_forward_slashes_to_back input output)