fix(snippet): use reserve

[eseiler]

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[seqan-actions]

Documentation preview available at https://docs.seqan.de/preview/seqan/hibf/308

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.73%. Comparing base (7b7cbd5) to head (e9df0c9).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #308   +/-   ##
=======================================
  Coverage   99.73%   99.73%           
=======================================
  Files          52       52           
  Lines        1887     1887           
  Branches        2        2           
=======================================
  Hits         1882     1882           
  Misses          5        5           

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