fix sv2 specifications link (#20229)

Author: patriciasantaana

src/content/docs/api-shield/security/schema-validation/index.mdx

@@ -175,7 +175,7 @@ To delete currently uploaded or learned schemas:
 
 ## Specifications
 
-Cloudflare currently only accepts [OpenAPI v3 schemas](https://swagger.io/specification/). The accepted file formats are YAML (`.yml` or `.yaml` file extension) and JSON (`.json` file extension).
+Cloudflare currently only accepts [OpenAPI v3 schemas](https://spec.openapis.org/oas/v3.0.3.html). The accepted file formats are YAML (`.yml` or `.yaml` file extension) and JSON (`.json` file extension).
 
 OpenAPI schemas generated by different tooling may not be specific enough to import to Schema Validation. We recommend using a third-party tool such as [Swagger Editor](https://swagger.io/tools/swagger-editor/) to ensure that schemas are compliant to the OpenAPI specification.