Update balena/open-balena-base Docker tag to v18.0.3

[balena-renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
balena/open-balena-base	final	patch	v18.0.2 -> v18.0.3

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Release Notes

balena-io-modules/open-balena-base (balena/open-balena-base)

### [`v18.0.3`](https://togithub.com/balena-io-modules/open-balena-base/blob/HEAD/CHANGELOG.md#v1803) [Compare Source](https://togithub.com/balena-io-modules/open-balena-base/compare/v18.0.3...v18.0.3) #### (2024-07-01) - Empty commit to rebuild open-balena-base to fix CVE-2024-6387. \[Carlo Miguel F. Cruz] ### [`v18.0.3`](https://togithub.com/balena-io-modules/open-balena-base/blob/HEAD/CHANGELOG.md#v1803) [Compare Source](https://togithub.com/balena-io-modules/open-balena-base/compare/v18.0.2...v18.0.3) #### (2024-07-01) - Empty commit to rebuild open-balena-base to fix CVE-2024-6387. \[Carlo Miguel F. Cruz]

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Configuration

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This PR has been generated by Renovate Bot.