Update version and changelog for 0.40.0 release. (#542) #2075

Job	Run time
Run local-emulator tests	1m 9s
Run local-emulator tests	1m 9s
Run backend tests with QA endpoint	33m 4s
Run backend tests with QA endpoint	11m 18s
Run calendar visualisation test	47s
Run calendar visualisation test	47s
Run backend tests with QA and prod endpoint	0s
Run backend tests with QA and prod endpoint	0s
Quantinuum - Build and test module (ubuntu-latest)	34m 19s
Quantinuum - Build and test module (ubuntu-latest)	18m 17s
Quantinuum - Build and test module (macos-14)	3m 43s
Quantinuum - Build and test module (macos-14)	3m 43s
Quantinuum - Build and test module (windows-latest)	9m 22s
Quantinuum - Build and test module (windows-latest)	9m 22s
Publish to pypi	0s
Publish to pypi	0s
Build docs	0s
Build docs	0s
	2h 7m 0s

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