chore(deps): update dependency redis to v3 (census-instrumentation#773)

Co-authored-by: renovate[bot] <renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

packages/opencensus-instrumentation-redis/package-lock.json

@@ -48,7 +48,7 @@
     "gts": "1.1.2",
     "mocha": "7.2.0",
     "nyc": "14.1.1",
-    "redis": "2.8.0",
+    "redis": "3.1.2",
     "rimraf": "3.0.2",
     "ts-node": "8.10.2",
     "typescript": "3.9.10"