Rule array-items does not support prefixItems keyword

[yethee]

Describe the bug
OpenAPI 3.1 inherits data types from JSON Schema 2020-12, where we can use prefixItems keyword to define tuple value, instead of items keyword.
After changes from #2638 we got an error, when schema contains prefixItems:

Schemas with "type: array", require a sibling "items" field

To Reproduce

test.yaml:

---
openapi: "3.1.0"
components:
  schemas:
    IssueWithPrefixItems:
      type: array
      prefixItems:
        - type: string
        - type: integer
      minItems: 2
      maxItems: 2
      additionalItems: false

Run validation:

npx @stoplight/spectral-cli lint test.yaml

5:26    error  array-items            Schemas with "type: array", require a sibling "items" field  components.schemas.IssueWithPrefixItems

Expected behavior
Field items should not be required when prefixItems field is defined.

Environment (remove any that are not applicable):

npm ls @stoplight/spectral-rulesets

`-- @stoplight/spectral-cli@6.11.1
  +-- @stoplight/spectral-ruleset-bundler@1.5.2
  | `-- @stoplight/spectral-rulesets@1.19.1 deduped
  `-- @stoplight/spectral-rulesets@1.19.1

Additional context
This issue related to #2638.