fix: missing operation schema exceptions

[erunion]

☁️   CI App

🧰 What's being changed?

• Updates our oas dependency to fix a bug where if a supplied path+method combination didn't exist in an OAS it was being searched for in though we'd still return an instance of the Operation class, we'd return it with an undefined schema property. This error would then cascase and throw failures on any accessor of that class. Check out fix: operation being set to undefined if not found oas#371 for tests.

🧬 Testing

Check out the attached manual-api-missingInOas.json example definition.

Against next, this is what it currently looks like:

And with this fix:

[rafegoldberg]

Not as looped in on this, but the code looks good to me!

[billhimmelsbach]

Looking good!