CI(deps): Update alpine Docker tag to v3.19

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
alpine	final	minor	3.18 -> 3.19

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[echoix]

What are the use cases of users of the Docker images? If they simply use it inside the container, I don't see how it would impact them if they go and pull a newer beta image.

If they copy out the compiled binaries outside of the container, then for sure some things change, and the way for them to keep having a stable image is to pin it and update when they need.

So, I approve that it should go through.

[neteler]

There are other docker images which depend on this one, e.g.

mundialis/esa-snap#25

but I guess we can only move forward here...

[echoix]

Okay then! I consider downstream repos uses like this kinda out of scope of grass to maintain, and if it were to be critical, the downstream user would have pinned their image, and raised an issue if the state no longer suits them.