fix(deps): update dependency prisma-binding to v2.2.9

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
prisma-binding	dependencies	patch	2.2.8 -> 2.2.9	source

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Release Notes

graphcool/graphcool-binding

### [`v2.2.9`](https://renovatebot.com/gh/graphcool/graphcool-binding/releases/v2.2.9) [Compare Source](https://renovatebot.com/gh/graphcool/graphcool-binding/compare/v2.2.8...v2.2.9) ##### Bug Fixes - Support nullable type declarations ([abf8cb2](https://renovatebot.com/gh/graphcool/graphcool-binding/commit/abf8cb2)), closes [#​188](https://renovatebot.com/gh/graphcool/graphcool-binding/issues/188)

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