Move cmake_minimum_required above project line and upgrade minmum cma…

[adamkewley]

Minor drive-by change.

When building dependencies with a modern cmake/VisualStudio etc. you'll see these two warnings.

The first is because cmake_minimum_required() must be called before project()

$ cmake -S dependencies -B deps-build -DCMAKE_INSTALL_PREFIX=${PWD}/deps-install -G"Visual Studio 17 2022" -A x64 -DOPENSIM_WITH_CASADI=OFF -DOPENSIM_WITH_TROPTER=OFF
CMake Warning (dev) at CMakeLists.txt:5 (project):
  cmake_minimum_required() should be called prior to this top-level project()
  call.  Please see the cmake-commands(7) manual for usage documentation of
  both commands.
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Deprecation Warning at CMakeLists.txt:7 (cmake_minimum_required):
  Compatibility with CMake < 3.5 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


-- Configuring done (0.1s)
-- Generating done (0.1s)
-- Build files have been written to: C:/Users/adamk/Desktop/opensim-core/deps-build

The second is because modern cmake is deprecating cmake <3.4:

$ cmake -S dependencies -B deps-build -DCMAKE_INSTALL_PREFIX=${PWD}/deps-install -G"Visual Studio 17 2022" -A x64 -DOPENSIM_WITH_CASADI=OFF -DOPENSIM_WITH_TROPTER=OFF
CMake Deprecation Warning at CMakeLists.txt:6 (cmake_minimum_required):
  Compatibility with CMake < 3.5 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


-- Configuring done (0.1s)
-- Generating done (0.1s)
-- Build files have been written to: C:/Users/adamk/Desktop/opensim-core/deps-build

This changeset stops those warnings from popping up

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This change is