fix(deps): pin dependencies

This MR contains the following updates:

Package	Type	Update	Change
docker	service-image	pinDigest	-> 7370a6c
docker	image	pinDigest	-> 7370a6c
poethepoet (changelog)	dev	pin	^0.29.0 -> 0.29.0
pytest (changelog)	dev	pin	^8.3.2 -> 8.4.2
pytest-cov (changelog)	dev	pin	^5.0.0 -> 5.0.0
registry.gitlab.developers.cam.ac.uk/uis/devops/lib/ucam-faas-python	final	pinDigest	-> 5d5373a
structlog (changelog)	dev	pin	^24.4.0 -> 24.4.0

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