chore: release 3.1.8 (#337)

🤖 I have created a release \*beep\* \*boop\*
---
### [3.1.8](https://www.github.com/googleapis/nodejs-containeranalysis/compare/v3.1.7...v3.1.8) (2021-08-17)


### Bug Fixes

* **build:** migrate to using main branch ([#336](https://www.github.com/googleapis/nodejs-containeranalysis/issues/336)) ([3fbaf02](https://www.github.com/googleapis/nodejs-containeranalysis/commit/3fbaf02e2dc83730d1222255ad2f6ab6d34f4be0))
* **deps:** google-gax v2.24.1 ([#338](https://www.github.com/googleapis/nodejs-containeranalysis/issues/338)) ([6f0b19a](https://www.github.com/googleapis/nodejs-containeranalysis/commit/6f0b19a20b73f542c6e88f954fc3e159b9e73f82))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

Author: release-please[bot]

container-analysis/snippets/package.json

@@ -14,7 +14,7 @@
     "test": "mocha --timeout 100000 test/**.test.js"
   },
   "dependencies": {
-    "@google-cloud/containeranalysis": "^3.1.7",
+    "@google-cloud/containeranalysis": "^3.1.8",
     "@google-cloud/pubsub": "^2.0.0",
     "p-retry": "^4.1.0"
   },