message: update git-cmake-format and version requirement
diff: message(STATUS "Configuring and building git-cmake-format")
  ginkgo_load_git_package(git-cmake-format
  "https://github.com/ginkgo-project/git-cmake-format.git"
  - "29c23665d624e1cae1308bec651706fdaa8fe38b"
  - "-DGCF_CLANGFORMAT_MINIMAL_VERSION=5.0.0")
  + "be9554a5d71030dcc23f1eb355c41ab9d876e776"
  + "-DGCF_CLANGFORMAT_MINIMAL_VERSION=8.0.0")
  add_subdirectory(${CMAKE_CURRENT_BINARY_DIR}/src
  ${CMAKE_CURRENT_BINARY_DIR}/build EXCLUDE_FROM_ALL)
  