validate-install-from-source: bump Alpine LTS to latest non-EOL one #2052
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The Alpine container we use still is at version v3.14 (which, from a numerophile's point of view is a quite pleasing number). However, this Alpine version is past its support, as pointed out in actions/checkout#2246 (comment)
One fallout is that since I upgraded Git Credential Manager's GitHub workflows to require Node.JS 24, we are now greeted with this error:
For details about this run, see
https://github.com/git-ecosystem/git-credential-manager/actions/runs/17937675613/job/51006830230
Let's switch to the oldest, just barely supported Alpine version (https://alpinelinux.org/releases/ says that v3.19 will be out of support this November).