Update API client with latest OpenAPI spec (#328)

* Update API client with latest OpenAPI spec

* Use a cache bust for the OpenAPI spec

Author: SamyPesse

.changeset/tiny-pandas-run.md

@@ -0,0 +1,5 @@
+---
+'@gitbook/api': minor
+---
+
+Update API client with latest OpenAPI spec

packages/api/build.sh

@@ -7,7 +7,7 @@ mkdir ./spec
 LOCAL_OPENAPI_FILE=../../../gitbook-x/packages/api-client/static/openapi.yaml
 
 if [[ -z "${GITBOOK_OPENAPI_URL}" ]]; then
-  OPENAPI_URL="https://api.gitbook.com/openapi.yaml"
+  OPENAPI_URL="https://api.gitbook.com/openapi.yaml?cacheBust=$(date +%s)"
 else
   OPENAPI_URL="${GITBOOK_OPENAPI_URL}"
 fi