v0.138.0

What's Changed

• openapi3gen: clear nullable on exported component bodies by @0-don in #1164
• openapi3: add test for issue #927 (nullable not respected on $ref schemas) by @fenollp in #1165
• test: move public-API tests to external _test packages by @fenollp in #1168
• feat(openapi3): add per-type validation errors with cluster wrappers by @reuvenharrison in #1166
• feat(openapi3conv): canonicalization pass for 3.0 -> 3.x by @reuvenharrison in #1162
• openapi3conv: test Upgrade on many documents by @fenollp in #1169

Full Changelog: v0.137.0...v0.138.0