custom StacIO init needs to call parent init

[tylere]

Related Issue(s):

none

Description:
This fixes tutorial code that accesses S3, which probably broke with commit 01f71b1.

PR Checklist:

• pre-commit hooks pass locally
• Tests pass (run scripts/test)
• Documentation has been updated to reflect changes, if applicable
• This PR maintains or improves overall codebase code coverage.
• Changes are added to the CHANGELOG. See the docs for information about adding to the changelog.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8004c10) 91.18% compared to head (9c5bc59) 91.18%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1308   +/-   ##
=======================================
  Coverage   91.18%   91.18%           
=======================================
  Files          51       51           
  Lines        7023     7023           
  Branches     1005     1005           
=======================================
  Hits         6404     6404           
  Misses        444      444           
  Partials      175      175           

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