build(deps): bump alpine from 3.18.5 to 3.20.2

[dependabot]

Bumps alpine from 3.18.5 to 3.20.2.

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[Iceber]

alpine comes with a 2-year maintenance period for each minor version.
We will switch to the latest version 6 months before the end of the period, but we need to make sure that the latest version has more than 2 fixes.

https://www.alpinelinux.org/releases/

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.