Depend on grpcio<2, protobuf<4

[alexjpwalker]

What is the goal of this PR?

We increased the flexibility of our dependency requirements. Any version of grpcio < 2 and protobuf < 4 are now acceptable.

What are the changes implemented in this PR?

We have previously had to do a new release of this client whenever someone depends on a different version of grpcio or protobuf in their project - in particular, even if they are depending on a newer version. This is not a good experience for developers.

Now, we accept any version that is expected to be non-breaking.

[typedb-bot]

PR Review Checklist

Do not edit the content of this comment. The PR reviewer should simply update this comment by ticking each review item below, as they get completed.

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Trivial Change

• This change is trivial and does not require a code or architecture review.

Code

• Packages, classes, and methods have a single domain of responsibility.
• Packages, classes, and methods are grouped into cohesive and consistent domain model.
• The code is canonical and the minimum required to achieve the goal.
• Modules, libraries, and APIs are easy to use, robust (foolproof and not errorprone), and tested.
• Logic and naming has clear narrative that communicates the accurate intent and responsibility of each module (e.g. method, class, etc.).
• The code is algorithmically efficient and scalable for the whole application.

Architecture

• Any required refactoring is completed, and the architecture does not introduce technical debt incidentally.
• Any required build and release automations are updated and/or implemented.
• Any new components follows a consistent style with respect to the pre-existing codebase.
• The architecture intuitively reflects the application domain, and is easy to understand.
• The architecture has a well-defined hierarchy of encapsulated components.
• The architecture is extensible and scalable.