Update changelog [v0.5.x] #3707

Job	Run time
document	52s
smoke (amaranth-lang/amaranth-boards)	36s
smoke (amaranth-lang/amaranth-stdio)	51s
smoke (amaranth-lang/amaranth-soc)	46s
test (3.12)	3m 53s
test (3.10)	3m 21s
test (3.9)	2m 30s
test (3.11)	2m 40s
check-links	57s
test (pypy-3.9)	6m 44s
test (3.8)	2m 49s
test (pypy-3.10)	5m 16s
test (3.13-dev)	3m 28s
test (pypy-3.8)	6m 44s
publish-docs	8s
publish-docs-dev	0s
required	2s
publish-package	10s
publish-schemas	9s
publish-release	0s
	41m 56s

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