chore: update dependencies for at commons 4.0.0

[XavierChanth]

- What I did

• Updated locally dependency versions
• Put in place dependency overrides for at_client,at_onboarding_cli,at_auth,at_server_status on both noports_core and sshnoports
• Fixed lint errors related to value assertions:
  • Stopped checking whether AtKey.key or AtKey.metadata are null
  • Fixed a potentially null notification.value in the sshrvd_impl notification handler

- How I did it

- How to verify it

• noports_core Unit tests for lint errors and type errors
• e2e tests for any functional errors

- Description for the changelog
chore: update dependencies for at commons 4.0.0

[XavierChanth]

Thanks @purnimavenkatasubbu for investigating this further

@gkc we will also have to update the dependencies for sshnp_flutter, it should be as simple as updating the same dependencies as for sshnoports.

[gkc]

All looks fine but I presume this should not be merged until the packages have been published and we can remove the dependency overrides?

[gkc]

All looks fine but I presume this should not be merged until the packages have been published and we can remove the dependency overrides?

[XavierChanth]

@purnimavenkatasubbu can you follow up on this PR when you get a chance?

[purnimavenkatasubbu]

@XavierChanth I have raised a new PR #767, I think this PR has some missing changes.