CMake 3.27 Deprecation warnings (dependencies)

[ptheywood]

Cmake 3.26?27? deprecates compatibility with CMake < 3.5 in cmake_minimum_required calls.

These are triggered by sevarl of our dependencies. We should update versions of our depenenceies to ensure futre CMake support.

• [ ] GoogleTest
  • Fixed by https://github.com/google/googletest/commit/4fed5f285030085b096c930ff03e42c7814739b2, included in the v1.14.0 release.
• [ ] RapidJSON
  • Not fixed upstream, an open issue from May. Could patch ourselves during fetch content?
• Visualisation:
  • [ ] CMakeRC
  • This is vendored into our cmake rather than fetched, so we can update our committed copy. Upstream has fixed this in https://github.com/vector-of-bool/cmrc/commit/91c9522ee59654e2f4d9701947a4600a4436d076. It is not included in a tagged release.