Update balena/open-balena-base Docker tag to v18.0.20

[balena-renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
balena/open-balena-base	final	patch	18.0.19 -> 18.0.20

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Release Notes

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

### [`v18.0.20`](https://redirect.github.com/balena-io-modules/open-balena-base/blob/HEAD/CHANGELOG.md#v18020) [Compare Source](https://redirect.github.com/balena-io-modules/open-balena-base/compare/v18.0.20...v18.0.20) #### (2024-12-03) - Update dependency node to v22.12.0 \[Self-hosted Renovate Bot] ### [`v18.0.20`](https://redirect.github.com/balena-io-modules/open-balena-base/blob/HEAD/CHANGELOG.md#v18020) [Compare Source](https://redirect.github.com/balena-io-modules/open-balena-base/compare/v18.0.19...v18.0.20) #### (2024-12-03) - Update dependency node to v22.12.0 \[Self-hosted Renovate Bot]

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Configuration

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This PR has been generated by Renovate Bot.