docs: update changelog. #3755

Job	Run time
smoke (amaranth-lang/amaranth-soc)	49s
check-links	12m 52s
smoke (amaranth-lang/amaranth-boards)	36s
document	50s
smoke (amaranth-lang/amaranth-stdio)	39s
test (3.8)	3m 29s
test (3.11)	4m 40s
test (3.9)	2m 52s
test (3.10)	3m 19s
test (pypy-3.11)	5m 4s
test (pypy-3.8)	7m 18s
test (3.12)	4m 39s
test (pypy-3.9)	6m 18s
test (pypy-3.10)	5m 26s
test (3.13-dev)	3m 10s
publish-docs	9s
publish-docs-dev	0s
required	2s
publish-schemas	5s
publish-package	13s
publish-release	0s
	1h 2m 30s

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