Update dependency reflex-core to v1.2.3

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
reflex-core	patch	==1.2.2 -> ==1.2.3

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Release Notes

pangolock/reflex-core

### [`v1.2.3`](https://togithub.com/pangolock/reflex-core/releases/v1.2.3) [Compare Source](https://togithub.com/pangolock/reflex-core/compare/v1.2.2...v1.2.3) Add support for python 3.6

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