Upgrade pipeline scripts version (Azure#9172)

* Add free-form object spec for testing purpose.

* Revert "Add free-form object spec for testing purpose."

This reverts commit b711d80.

* Upgrade pipeline script version.

Integrate rest-api-specs-scripts latest version with the fix
in oav about output exception information when command switch pretty
is on.

.azure-pipelines-preproduction/package.json

@@ -11,7 +11,7 @@
   "license": "MIT",
   "devDependencies": {
     "@azure/avocado": "^0.6.3",
-    "@azure/rest-api-specs-scripts": "^0.7.2",
+    "@azure/rest-api-specs-scripts": "^0.7.3",
     "@ts-common/commonmark-to-markdown": "^1.2.0",
     "@ts-common/fs": "0.2.0",
     "@ts-common/iterator": "^0.3.6",

package.json

@@ -11,7 +11,7 @@
   "license": "MIT",
   "devDependencies": {
     "@azure/avocado": "^0.6.3",
-    "@azure/rest-api-specs-scripts": "^0.7.2",
+    "@azure/rest-api-specs-scripts": "^0.7.3",
     "@ts-common/commonmark-to-markdown": "^1.2.0",
     "@ts-common/fs": "0.2.0",
     "@ts-common/iterator": "^0.3.6",