Use std library errors

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 5.48926% with 792 lines in your changes are missing coverage. Please review.

Project coverage is 62.30%. Comparing base (28869df) to head (0a500f4).

Files	Patch %	Lines
core/models/contacts.go	1.53%	64 Missing :warning:
core/models/sessions.go	8.33%	51 Missing and 4 partials :warning:
services/ivr/vonage/service.go	0.00%	46 Missing :warning:
core/ivr/ivr.go	0.00%	43 Missing :warning:
web/ivr/ivr.go	0.00%	23 Missing and 1 partial :warning:
services/ivr/twiml/service.go	0.00%	20 Missing :warning:
core/models/tickets.go	0.00%	19 Missing :warning:
core/runner/runner.go	0.00%	19 Missing :warning:
core/models/assets.go	5.26%	18 Missing :warning:
core/tasks/handler/ctasks/msg_event.go	5.55%	17 Missing :warning:
... and 120 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #251 +/- ## ========================================== - Coverage 62.50% 62.30% -0.21% ========================================== Files 186 186 Lines 10296 10336 +40 ========================================== + Hits 6436 6440 +4 - Misses 3005 3030 +25 - Partials 855 866 +11 ```

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