Bump version to v1.7.7, update CHANGELOG #5642

Job	Run time
Cache identify	5s
Shellcheck	5s
Dependency	5s
Prepare	2m 4s
Ruff check and force	15s
Check commit	46s
Run pytest using Python 3.13	32s
Run mypy	28s
Process test coverage	22s
Process test complexity	15s
Build and publish Python 🐍 distributions 📦 to TestPyPI	42s
	5m 39s

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