chore(deps): update dependency google-cloud-containeranalysis to v2.4…

….0 (#152)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-containeranalysis](https://togithub.com/googleapis/python-containeranalysis) | `==2.3.0` -> `==2.4.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-containeranalysis/2.4.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-containeranalysis/2.4.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-containeranalysis/2.4.0/compatibility-slim/2.3.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-containeranalysis/2.4.0/confidence-slim/2.3.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>googleapis/python-containeranalysis</summary>

### [`v2.4.0`](https://togithub.com/googleapis/python-containeranalysis/blob/master/CHANGELOG.md#&#8203;240-httpswwwgithubcomgoogleapispython-containeranalysiscomparev230v240-2021-06-30)

[Compare Source](https://togithub.com/googleapis/python-containeranalysis/compare/v2.3.0...v2.4.0)

##### Features

-   add always_use_jwt_access ([#&#8203;147](https://www.github.com/googleapis/python-containeranalysis/issues/147)) ([1f55871](https://www.github.com/googleapis/python-containeranalysis/commit/1f558713a683e3b48d9d7fba2c015e92818850fd))

##### Bug Fixes

-   disable always_use_jwt_access ([#&#8203;151](https://www.github.com/googleapis/python-containeranalysis/issues/151)) ([7768ae1](https://www.github.com/googleapis/python-containeranalysis/commit/7768ae1ce4a32fa25ef5c0fb86f8981fed038297))

##### Documentation

-   omit mention of Python 2.7 in 'CONTRIBUTING.rst' ([#&#8203;1127](https://www.github.com/googleapis/python-containeranalysis/issues/1127)) ([#&#8203;141](https://www.github.com/googleapis/python-containeranalysis/issues/141)) ([a588841](https://www.github.com/googleapis/python-containeranalysis/commit/a58884154f23caf453040ad314c0a2d4416952f2))

</details>

---

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container_registry/container_analysis/snippets/requirements.txt

@@ -1,5 +1,5 @@
 google-cloud-pubsub==2.6.0
-google-cloud-containeranalysis==2.3.0
+google-cloud-containeranalysis==2.4.0
 grafeas==1.1.0
 pytest==5.3.0; python_version > "3.0"
 pytest==4.6.6; python_version < "3.0"