Bump to v1.7.8 release-version, update CHANGELOG #5666

Job	Run time
Shellcheck	6s
Dependency	6s
Cache identify	6s
Prepare	1m 48s
Ruff check and force	22s
Check commit	38s
Run pytest using Python 3.13	29s
Run mypy	29s
Process test coverage	22s
Process test complexity	24s
Build and publish Python 🐍 distributions 📦 to TestPyPI	8s
	4m 58s

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