Bump the CMake version in ubuntu_install_cmake_source.sh to 3.14.7. (#9424)
Bump the CMake version in ubuntu_install_cmake_source.sh to 3.14.7. (#9424)

* This is required in platforms we need to build xgboost from source
 * Fixes #9414
Laurawly/tvm-1,Laurawly/tvm-1,Laurawly/tvm-1,dmlc/tvm,dmlc/tvm,Laurawly/tvm-1,Laurawly/tvm-1,Laurawly/tvm-1,Laurawly/tvm-1,Laurawly/tvm-1,dmlc/tvm,dmlc/tvm,Laurawly/tvm-1,dmlc/tvm,dmlc/tvm,dmlc/tvm,dmlc/tvm,dmlc/tvm,Laurawly/tvm-1