Use #image_resize from vectory

[alexeymorozov]

See metanorma/vectory#28

Metanorma PR checklist

• Breaking changes (list related PRs)
• Documentation update required (create task for this)
• External dependency introduced (documentation update need)
• Gem with native library introduced

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d4310c4) 95.02% compared to head (6c852a1) 95.02%.

❗ Current head 6c852a1 differs from pull request most recent head 8e68cc5. Consider uploading reports for the commit 8e68cc5 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #89   +/-   ##
=======================================
  Coverage   95.02%   95.02%           
=======================================
  Files           7        7           
  Lines         523      523           
=======================================
  Hits          497      497           
  Misses         26       26           

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