Update changelog for v1.29 release. #49

Job	Run time
initialize / define-constants	3s
test / lint-and-build	41s
test / test-coverage (ubuntu-latest, 3.11)	33s
test / test-coverage (ubuntu-latest, 3.10)	36s
test / test-coverage (windows-latest, 3.12)	1m 22s
test / test-coverage (macos-latest, 3.12)	42s
test / test-coverage (ubuntu-latest, 3.12)	48s
test / test-coverage (macos-latest, 3.10)	56s
test / test-coverage (ubuntu-latest, 3.13)	36s
test / test-coverage (macos-latest, 3.11)	27s
test / test-coverage (macos-latest, 3.13)	27s
test / test-coverage (windows-latest, 3.10)	1m 37s
test / test-coverage (windows-latest, 3.11)	1m 25s
test / test-coverage (windows-latest, 3.13)	1m 36s
report / report-coverage	35s
docsgen / generate	1m 0s
docsgen / publish	24s
package / package	18s
publish-pypi	16s
publish-github	36s
	14m 58s

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