Upgrade to Python 3.11

[bnewm0609]

This PR addresses an update to the dataclasses module in python 3.11, which prevents adding mutable fields to dataclasses by default. There were a few places where this appears.

First, the springs.cli.Flag dataclass. This change was addressed by implementing a __hash__ method.

Second, in the configs in tests/fixtures/configs. Here, the PR makes dataclasses hashable by passing unsafe_hash=True to the dataclass wrapper function.

There are other approaches to this outlined here:

• using default_factory instead of directly instantiating the. This led to an error within omegaconf: Dict[Any, Any] cannot be assigned type Field. (or something like that)
• using the sp.fobj method to wrap the . This led to an omegaconf error cannot pickle 'mappingproxy' object (might be related to deepcopying a dataclass)
• explicitly defining __hash__ methods on all of the configs in tests/fixtures/configs. This seemed like too much work compared to just using unsafe_hash=True.

[soldni]

Thank you @bnewm0609! I hadn't researched options myself, so this was very helpful. I decided to go with the default_factory= option as it is (a) in line with what omegaconf library recommends, and (b) safer.