Bump alpine from 3.18 to 3.23; this bumps sqlite from 3.41 to 3.51

[IsaacG]

Track docs also need an update

Closes #51

[IsaacG]

Update Message

Title: SQLite Updated to 3.51.2 (from 3.41.2)

Body
The test runner was [updated from Alpine 3.18 to 3.21](https://github.com/exercism/sqlite-test-runner/pull/52).

This bumps SQLite from 3.41.2 (released 2023-03-22) to 3.51.2 (released 2026-01-09).

The most notable change we noticed was some test breakage around JSON parsing.
See [this discussion](https://github.com/exercism/sqlite/pull/228#issuecomment-4182202171).
Those are likely due to the 3.45.0 changes:

> 1.  All JSON functions are rewritten to use a new internal parse tree format called [JSONB](https://www.sqlite.org/json1.html#jsonbx). The new parse-tree format is serializable and hence can be stored in the database to avoid unnecessary re-parsing whenever the JSON value is used.
> 2.  New versions of JSON-generating functions generate binary JSONB instead of JSON text.

For the full SQLite change log, [see the release history page](https://www.sqlite.org/changes.html).

[IsaacG]

Forum post: https://forum.exercism.org/t/sqlite-updated-to-3-51-2-from-3-41-2/41944

I posted a site update, too.