Update alpine Docker tag to v3.20

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
alpine		minor	3.19 -> 3.20
alpine	final	minor	3.19 -> 3.20
alpine	stage	minor	3.19 -> 3.20

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[at-wat]

Dependency tree of integration builder contains unexisting regex==2023.12.26

[at-wat]

https://git.alpinelinux.org/aports/tree/community/py3-regex/APKBUILD?h=3.20-stable
Alpine uses the version which is not published to pypi

[renovate]

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