JSONSnapshotExtension will not work with Python 3.7

[dtczest]

Describe the bug

JSONSnapshotExtension will not work with Python 3.7.
syrupy/extensions/json/__init__.py imports SerializableData from syrupy.types ONLY if TYPE_CHECKING is True. In Python 3.7, TYPE_CHECKING is false. Trying to use JSONSnapshotExtension in Python 3.7 will result in a runtime error upon import:
NameError: name 'SerializableData' is not defined

To reproduce

Steps to reproduce the behavior:
In a Python 3.7 environment, try to import from syrupy.extensions.json import JSONSnapshotExtension
You will see error:
NameError: name 'SerializableData' is not defined

Expected behavior

The code should handle this scenario

Environment (please complete the following information):

• OS: Mac OSX
• Syrupy Version: 1.7.0
• Python Version: 3.7.7

[dtczest]

Thanks!

[tophat-opensource-bot]

🎉 This issue has been resolved in version 1.7.2 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀

[dtczest]

So I tried this with 1.7.2, and now it's also happening with 'PropertyPath' (line 57). I assume it'll happen with PropertyMatcher too (line 59). All the rest looks good. @noahnu

Edit: yes, fixing those 2 lines makes it work for me.

[dtczest]

Opened #587