chore(deps): bump openapi-generator to 7.26.0

Picks up OpenAPITools/openapi-generator#25066, which enforces not: enum when matching oneOf members.

Author: ariesclark

openapitools.json

@@ -1,6 +1,6 @@
 {
   "spaces": 2,
   "generator-cli": {
-    "version": "7.24.0"
+    "version": "7.26.0"
   }
 }