chore: bump alpine version in dockerfile

[naioja]

Using a newer supported alpine version that still provides security fixes.

[codecov]

Codecov Report

Merging #1151 (a9679e1) into main (d2f1185) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1151   +/-   ##
=======================================
  Coverage   61.89%   61.89%           
=======================================
  Files          23       23           
  Lines        1475     1475           
=======================================
  Hits          913      913           
  Misses        476      476           
  Partials       86       86           

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[simskij]

Not sure whether this is relevant given that we only use alpine to fetch the certs and the timezone. Wouldn't hurt though, so I guess why not 😅

[naioja]

Not sure whether this is relevant given that we only use alpine to fetch the certs and the timezone. Wouldn't hurt though, so I guess why not 😅

Running trivy on the old image was a bit unsettling :)