chore: bump libopenapi to v0.41.2 and go-yaml to v0.1.1

[daveshanley]

Bumps libopenapi from v0.41.1 to v0.41.2, which also moves go-yaml from v0.1.0 to v0.1.1.

• libopenapi v0.41.2 labels its schema hash fields. Before, oneOf, allOf and anyOf with the same members (or minimum: 5 and maximum: 5) hashed the same, and the validator's compiled-schema cache is keyed on that hash. In the layout from v0.14.0: response validation fails with "schema node was not found in its root document" for multi-file specs (inline schemas with cross-file $refs) #314, an inline allOf was validated with its sibling oneOf schema: {"name":"x"} failed with "'oneOf' failed" and {"name":5} passed.
• go-yaml v0.1.1 dumps node trees without modifying them, the upstream fix behind NewValidator corrupts the shared document model when a schema has a recursive $ref target #304 and ValidateOpenAPIDocument mutates the caller's yaml.Node tree when rendering a violation (data race / order-dependent results when rules run concurrently) #322.

Verification

• Every layout from v0.14.0: response validation fails with "schema node was not found in its root document" for multi-file specs (inline schemas with cross-file $refs) #314 compiles and validates correctly, with the allOf and oneOf routes in one spec. On v0.15.0 the allOf route gives the wrong answer.
• Full suite passes on Go 1.26.4 and Go 1.27.0, and with -race.
• golangci-lint v2.12.1: 0 issues. Coverage is unchanged.

Fixes #314

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.36%. Comparing base (f140310) to head (c22657a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #328   +/-   ##
=======================================
  Coverage   98.36%   98.36%           
=======================================
  Files          79       79           
  Lines        9433     9433           
=======================================
  Hits         9279     9279           
  Misses        129      129           
  Partials       25       25           

Flag	Coverage Δ
unittests	98.36% <ø> (ø)

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