v21.2.19
refactor(zone.js): remove legacy browser support (#63511)
fix(zone.js): avoid type error on custom object rejection with rejection property
refactor: update license text to point to angular.dev (#57901)
fix(zone.js): Support jasmine v6
refactor(zone.js): Improve missing proxy zone error for jest imported (#64497) test functions
fix(zone.js): validate __Zone_symbol_prefix to prevent DOM clobbering attacks
fix(zone.js): allow draining microtasks in `Promise.then` (through flag)