Update to the latest Hangfire

[pmachapman]

We will need to use a connection string that contains w=majority&readConcernLevel=linearizable.

[pmachapman]

Hangfire.Mongo has reverted its change to separate stateHistory, so we can use it without the updated connection string.

Further details:

• Hangfire Tasks getting randomly Cancelled with Hangfire.Mongo 1.13.1 gottscj/Hangfire.Mongo#445
• re intoduce StateHistory on JobDto for better isolation (#445) gottscj/Hangfire.Mongo#450