Update dependency @kintone/plugin-packer to v5.0.3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@kintone/plugin-packer	5.0.2 -> 5.0.3

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Release Notes

kintone/js-sdk

### [`v5.0.3`](https://togithub.com/kintone/js-sdk/compare/@kintone/webpack-plugin-kintone-plugin@5.0.2...@kintone/webpack-plugin-kintone-plugin@5.0.3) [Compare Source](https://togithub.com/kintone/js-sdk/compare/@kintone/plugin-packer@5.0.2...@kintone/plugin-packer@5.0.3)

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Configuration

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