Fix cmake_minimum_require in libshm (#58306)
Summary:
Deprecation warning reported by cmake:
```
CMake Deprecation Warning at CMakeLists.txt (cmake_minimum_required):
Compatibility with CMake < 2.8.12 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.
```
This is the only place that requires bumping min version. There're two others but only in `third_party` folder.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/58306
Reviewed By: bdhirsh
Differential Revision: D28446097
Pulled By: zhouzhuojie
fbshipit-source-id: af5ef50e61bd57dc36089ebe62db70ba0081864c
