fix: upgrade @google-cloud/speech from 4.5.2 to 4.9.0 (#17)

Snyk has created this PR to upgrade @google-cloud/speech from 4.5.2 to 4.9.0.

See this package in npm:
https://www.npmjs.com/package/@google-cloud/speech

See this project in Snyk:
https://app.snyk.io/org/davehorton/project/b7e09765-19b2-4aa5-90ba-10432e250041?utm_source=github&utm_medium=referral&page=upgrade-pr

package.json

@@ -17,7 +17,7 @@
     "url": "https://github.com/jambonz/jambonz-api-server.git"
   },
   "dependencies": {
-    "@google-cloud/speech": "^4.2.0",
+    "@google-cloud/speech": "^4.9.0",
     "@google-cloud/text-to-speech": "^3.1.3",
     "@jambonz/db-helpers": "^0.6.12",
     "@jambonz/realtimedb-helpers": "^0.4.14",