api-types: regen from @postio/openapi@1.0.3, lockstep bump 1.0.2 -> 1.0.3

Pulls the spec drift fix (PhoneResult.isReachable now boolean|null,
example values aligned with runtime, /connect 429+500 documented,
EmailResult example correctly shows smtpCheck=null/isCatchAll=null
for custom domains).

src/index.ts is gitignored; CI's pnpm -r run build regenerates from
the pinned @postio/openapi version.

Author: Oliver Kingston

packages/api-types/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@postio/api-types",
-  "version": "1.0.2",
+  "version": "1.0.3",
   "description": "TypeScript types for the Postio API, generated from @postio/openapi.",
   "license": "MIT",
   "type": "module",
@@ -45,7 +45,7 @@
     "typescript"
   ],
   "devDependencies": {
-    "@postio/openapi": "1.0.2",
+    "@postio/openapi": "1.0.3",
     "openapi-typescript": "^7.10.0",
     "typescript": "^5.9.3"
   },