feat: upgrade opossum from 5.1.3 to 6.2.1 (#62)

Snyk has created this PR to upgrade opossum from 5.1.3 to 6.2.1.

See this package in npm:
https://www.npmjs.com/package/opossum

See this project in Snyk:
https://app.snyk.io/org/nodeshift-agg/project/2fdda348-6ce6-42ea-838c-d09239a73d3a?utm_source=github&utm_medium=referral&page=upgrade-pr

package.json

@@ -33,7 +33,7 @@
     "eslint-plugin-promise": "^5.2.0",
     "husky": "^6.0.0",
     "nyc": "^15.1.0",
-    "opossum": "^5.1.3",
+    "opossum": "^6.2.1",
     "standard-version": "^9.3.0",
     "tap-spec": "^5.0.0",
     "tape": "^5.2.2"