Reland "[CMake] Bumps minimum version to 3.20.0."

All build bots should be updated now.

This reverts commit 44d38022ab29a3156349602733b3459df5beef93.

GitOrigin-RevId: ffb807ab5375b3f78df198dc5d4302b3b552242f
2 files changed
tree: 3ea15d37a42ab9d6a98130922a98b5a513fa6f6b
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT