Update Dockerfile alpine packages for cve fixes (#3973)

[bjee19]

Cherry-pick #3973. Update Dockerfile alpine packages libexpat and tiff to fix cves.

Verified NGINX Plus image does not contain libexpat or tiff alpine packages, and after these changes, the packages in the built docker image have the updated versions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.87%. Comparing base (877c415) to head (d072364).
⚠️ Report is 1 commits behind head on release-2.1.

Additional details and impacted files

@@             Coverage Diff              @@
##           release-2.1    #3983   +/-   ##
============================================
  Coverage        86.87%   86.87%           
============================================
  Files              128      128           
  Lines            16059    16059           
  Branches            62       62           
============================================
  Hits             13952    13952           
  Misses            1935     1935           
  Partials           172      172           

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