Add 0.20.1 to the changelog #5640

Job	Run time
build_linux (3.9)	40m 0s
build_windows (3.9)	1h 0m 27s
build_linux (3.10)	39m 34s
build_windows (3.10)	50m 22s
build_linux (3.11)	38m 39s
build_windows (3.11)	50m 12s
build_linux (3.12)	39m 1s
build_windows (3.12)	49m 16s
build_linux (3.13)	39m 19s
build_windows (3.13)	49m 37s
test_examples_linux (3.11, false, ubuntu-22.04)	8m 19s
test_linux (3.9, false, ubuntu-22.04)	11m 20s
array-api-conformity (3.10, false, ubuntu-22.04)	5m 51s
test_linux (3.10, false, ubuntu-22.04)	11m 12s
test_linux (3.11, false, ubuntu-22.04)	11m 18s
test_linux (3.12, false, ubuntu-22.04)	11m 44s
test_linux (3.13, false, ubuntu-22.04)	11m 28s
upload_linux	0s
test_windows (3.9, false, windows-latest)	12m 26s
test_windows (3.10, false, windows-latest)	13m 31s
test_windows (3.11, false, windows-latest)	13m 19s
test_windows (3.12, false, windows-latest)	13m 33s
test_windows (3.13, false, windows-latest)	13m 41s
upload_windows	0s
Clean up anaconda packages	0s
	9h 54m 9s

Provide feedback