Describe the bug
When creating a PlainSerializer a false positive of unresolved reference 'json' may be displayed.
'json' is a valid typing.Literal parameter.
Reference: https://docs.pydantic.dev/latest/concepts/serialization/#custom-serializers
I am assuming this is a plug-in issue and not an upstream PyCharm issue although I am not 100% sure.
To Reproduce
Expected behavior
When when_used="json" is provided no warning is displayed.
Environments (please complete the following information):
PyCharm 2023.2.4 (Professional Edition)
Build #PY-232.10203.26, built on October 31, 2023
Runtime version: 17.0.8.1+7-b1000.32 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
Linux 6.5.10-300.fc39.x86_64
Non-Bundled Plugins:
com.koxudaxi.ruff (0.0.25)
net.ashald.envfile (3.4.1)
com.koxudaxi.pydantic (0.4.9)
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