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

Unfortunatly not all buildbots are updated.

This reverts commit ffb807ab5375b3f78df198dc5d4302b3b552242f.

GitOrigin-RevId: e8e8707b4aa6e4cc04c0cffb2de01d2de71165fc
2 files changed
tree: f92fceec18d122bd4f6c18041e46b5bc66f8ebf1
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT