Use std library errors

[rowanseymour]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 30.57325% with 109 lines in your changes are missing coverage. Please review.

Project coverage is 81.87%. Comparing base (5af5142) to head (9e0338c).

Files	Patch %	Lines
cmd/docgen/docs/html_renderers.go	0.00%	28 Missing ⚠️
flows/engine/session.go	12.50%	14 Missing ⚠️
cmd/docgen/docs/html.go	0.00%	10 Missing ⚠️
flows/definition/legacy/definition.go	0.00%	8 Missing ⚠️
flows/routers/base.go	16.66%	5 Missing ⚠️
flows/runs/run.go	0.00%	5 Missing ⚠️
cmd/docgen/docs/base.go	0.00%	4 Missing ⚠️
flows/triggers/base.go	20.00%	4 Missing ⚠️
assets/static/source.go	25.00%	3 Missing ⚠️
cmd/docgen/completion/completion.go	0.00%	2 Missing ⚠️
... and 19 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1258      +/-   ##
==========================================
- Coverage   81.87%   81.87%   -0.01%     
==========================================
  Files         278      278              
  Lines       17595    17592       -3     
==========================================
- Hits        14406    14403       -3     
  Misses       2609     2609              
  Partials      580      580              

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