Updated sdk-api submodule.

apidocs/version.json

@@ -2,7 +2,7 @@
   "$schema": "https://raw.githubusercontent.com/dotnet/Nerdbank.GitVersioning/master/src/NerdBank.GitVersioning/version.schema.json",
   "inherit": true,
   "version": "0.1-alpha",
-  "versionHeightOffset": 1, // manually +1 each time the ext/sdk-api submodule tree is updated
+  "versionHeightOffset": 2, // manually +1 each time the ext/sdk-api submodule tree is updated
   "pathFilters": [
     ".",
     "../ext/sdk-api", // doesn't work yet: https://github.com/dotnet/Nerdbank.GitVersioning/issues/625

ext/sdk-api

@@ -1 +1 @@
-Subproject commit c251199235b283ada4e0c5afe352077f7453a680
+Subproject commit a91766dbffc8eb3a87c4f515e9163de36c646c67