fix(deps): update dependency @opencensus/propagation-stackdriver to v0.0.21 (#771)

Author: renovate-bot

handwritten/logging/package.json

@@ -49,7 +49,7 @@
     "@google-cloud/paginator": "^2.0.3",
     "@google-cloud/projectify": "^1.0.4",
     "@google-cloud/promisify": "^1.0.4",
-    "@opencensus/propagation-stackdriver": "0.0.20",
+    "@opencensus/propagation-stackdriver": "0.0.21",
     "arrify": "^2.0.1",
     "dot-prop": "^5.2.0",
     "eventid": "^1.0.0",