Update ruamel.yaml load call

[rly]

Motivation

Fix #1007

How to test the behavior?

curl https://raw.githubusercontent.com/hdmf-dev/hdmf-common-schema/main/hdmf-common.schema.json > hdmf-common-schema.json
validate_hdmf_spec src/hdmf/hdmf-common-schema -m hdmf-common-schema.json

Checklist

• Did you update CHANGELOG.md with your changes?
• Does the PR clearly describe the problem and the solution?
• Have you reviewed our Contributing Guide?
• Does the PR use "Fix #XXX" notation to tell GitHub to close the relevant issue numbered XXX when the PR is merged?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.57%. Comparing base (b575e50) to head (99327f6).
Report is 84 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1008   +/-   ##
=======================================
  Coverage   88.57%   88.57%           
=======================================
  Files          45       45           
  Lines        9503     9503           
  Branches     2703     2703           
=======================================
  Hits         8417     8417           
  Misses        764      764           
  Partials      322      322           

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