Add `$schema` to `cgmanifest.json` (#1082)

Co-authored-by: Jamie Magee <jamie.magee@microsoft.com>

src/Qir/Common/Externals/cgmanifest.json

@@ -1,4 +1,5 @@
 {
+  "$schema": "https://json.schemastore.org/component-detection-manifest.json",
   "Registrations": [
     {
       "Component": {
@@ -15,7 +16,8 @@
         "Type": "git",
         "Git": {
           "RepositoryUrl": "https://github.com/catchorg/Catch2",
-                    "CommitHash": "87074da73ecb1c2e7c35fd14f50ca21c4c002adc" }
+          "CommitHash": "87074da73ecb1c2e7c35fd14f50ca21c4c002adc"
+        }
       }
     },
     {
@@ -23,7 +25,8 @@
         "Type": "git",
         "Git": {
           "RepositoryUrl": "https://github.com/CLIUtils/CLI11",
-                    "CommitHash": "5cb3efabce007c3a0230e4cc2e27da491c646b6c" }
+          "CommitHash": "5cb3efabce007c3a0230e4cc2e27da491c646b6c"
+        }
       }
     }
   ]