Inherit version.json

apidocs/version.json

@@ -1,5 +1,6 @@
 {
   "$schema": "https://raw.githubusercontent.com/dotnet/Nerdbank.GitVersioning/master/src/NerdBank.GitVersioning/version.schema.json",
+  "inherit": true,
   "version": "0.1-alpha",
   "versionHeightOffset": 0, // manually +1 each time the ext/sdk-api submodule tree is updated
   "pathFilters": [