Update dependencies and go version to 1.18

[rowanseymour]

No description provided.

[codecov-commenter]

Codecov Report

Merging #49 (83ed02f) into main (f2ab874) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #49   +/-   ##
=======================================
  Coverage   75.21%   75.21%           
=======================================
  Files           3        3           
  Lines         238      238           
=======================================
  Hits          179      179           
  Misses         35       35           
  Partials       24       24           

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