Fix static-sdk JSON 6.2 API (#1104)

* Fix static-sdk.json data source

* Add 6.1, 6.2 source branches to OpenAPI spec

Author: yonihemi

api/v1/install/dev/6.2/static-sdk.json

@@ -1,4 +1,4 @@
 ---
 layout: none
 ---
-{{ site.data.builds.swift-6_2-branch.static_sdk | jsonify }}
+{{ site.data.builds.swift-6_2-branch.static-sdk | jsonify }}

openapi/swiftorg.yaml

@@ -255,6 +255,8 @@ components:
       enum:
         - main
         - '6.0'
+        - '6.1'
+        - '6.2'
     SourceBranch:
       anyOf:
         - $ref: '#/components/schemas/KnownSourceBranch'