⬆️ Update Add-on base image to v3.0.21

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/erik73/base/aarch64 (source)		patch	3.0.20 -> 3.0.21
ghcr.io/erik73/base/amd64 (source)		patch	3.0.20 -> 3.0.21
ghcr.io/erik73/base/amd64 (source)	final	patch	3.0.20 -> 3.0.21
ghcr.io/erik73/base/armv7 (source)		patch	3.0.20 -> 3.0.21
ghcr.io/erik73/base/i386 (source)		patch	3.0.20 -> 3.0.21

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Release Notes

erik73/addon-base (ghcr.io/erik73/base/aarch64)

### [`v3.0.21`](https://togithub.com/erik73/addon-base/releases/tag/v3.0.21) [Compare Source](https://togithub.com/erik73/addon-base/compare/v3.0.20...v3.0.21) ##### What’s changed ##### ⬆️ Dependency updates - ⬆️ Update Alpine base image to v3.20.1 [@​renovate](https://togithub.com/renovate) ([#​227](https://togithub.com/erik73/addon-base/pull/227))

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