[MAINT] Add stub to changelog for dev changes after 0.19.0 #5408

Job	Run time
build_linux (3.9)	36m 20s
build_linux (3.10)	36m 2s
build_linux (3.11)	35m 52s
build_linux (3.12)	38m 13s
build_windows (3.9)	1h 7m 14s
build_windows (3.10)	1h 10m 52s
build_linux (3.13)	36m 31s
build_windows (3.11)	1h 14m 7s
build_windows (3.12)	1h 8m 3s
build_windows (3.13)	1h 8m 23s
test_examples_linux (3.11, false, ubuntu-22.04)	8m 45s
test_linux (3.9, false, ubuntu-22.04)	12m 4s
array-api-conformity (3.10, false, ubuntu-22.04)	4m 58s
test_linux (3.10, false, ubuntu-22.04)	11m 0s
test_linux (3.11, false, ubuntu-22.04)	11m 15s
test_linux (3.12, false, ubuntu-22.04)	30m 13s
test_linux (3.13, false, ubuntu-22.04)	10m 49s
upload_linux	0s
test_windows (3.9, false, windows-2019)	15m 6s
test_windows (3.10, false, windows-2019)	16m 4s
test_windows (3.11, false, windows-2019)	14m 8s
test_windows (3.12, false, windows-2019)	14m 10s
test_windows (3.13, false, windows-2019)	15m 13s
upload_windows	0s
Clean up anaconda packages	0s
	11h 35m 22s

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