Many tests fail with insert-ordered-containers-0.3

The package seems to be relying on the broken instances in prior versions of this dependency:

```
/tmp/openapi3-3.2.4
 % cabal test --allow-newer=openapi3:insert-ordered-containers -c 'insert-ordered-containers^>=0.3
375 examples, 73 failures
Test suite spec: FAIL
```