Bump @azure/functions from 4.0.0-alpha.9 to 4.7.3 in /api-inmemory

Bumps [@azure/functions](https://github.com/Azure/azure-functions-nodejs-library) from 4.0.0-alpha.9 to 4.7.3.
- [Release notes](https://github.com/Azure/azure-functions-nodejs-library/releases)
- [Commits](Azure/azure-functions-nodejs-library@v4.0.0-alpha.9...v4.7.3)

---
updated-dependencies:
- dependency-name: "@azure/functions"
  dependency-version: 4.7.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

api-inmemory/package.json

@@ -10,7 +10,7 @@
     "test": "echo \"No tests yet...\""
   },
   "dependencies": {
-    "@azure/functions": "4.0.0-alpha.9"
+    "@azure/functions": "4.7.3"
   },
   "devDependencies": {
     "azure-functions-core-tools": "4.0.5095",