docs: fix jest.config.js

[SteelRazor47]

When following the docs to setup testing, you get the following error:

Failed to deserialize buffer as swc::config::Options
    JSON: {"jsc":{"parser":{"syntax":"typescript","decorators":true},"target":"es2023","transform":{"hidden":{"jest":true}}},"sourceMaps":"inline","module":{"type":"commonjs"},"filename":"integration-tests/setup.js"}

    Caused by:
        unknown variant `es2023`, expected one of `es3`, `es5`, `es2015`, `es2016`, `es2017`, `es2018`, `es2019`, `es2020`, `es2021`, `es2022`, `esnext` at line 1 column 246

It only happens when @swc/jest is manually installed, explicitly setting the target fixes it. In the starter it works since @swc/jest is not installed directly.

Steps to repro:

• npx create-medusa-app
• yarn test:integration:http (works)
• yarn add --dev @swc/jest
• yarn test:integration:http (error)

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[shahednasser]

Thanks!