Upgrade mock-apollo-client to v0.5.0

What does this MR do?

This upgrades mock-apollo-client to v0.5.0, which fixes an issue that made it impossible to mock queries that contained a @connection directive.

More info in:

• #292223 (closed)
• https://github.com/Mike-Gibson/mock-apollo-client/pull/20

Related to #292223 (closed)