chore(deps): update dependency com.google.cloud:google-cloud-dlp to v3.0.4 (#664)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-dlp](https://togithub.com/googleapis/java-dlp) | `3.0.3` -> `3.0.4` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-dlp/3.0.4/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-dlp/3.0.4/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-dlp/3.0.4/compatibility-slim/3.0.3)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-dlp/3.0.4/confidence-slim/3.0.3)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-dlp</summary>

### [`v3.0.4`](https://togithub.com/googleapis/java-dlp/blob/master/CHANGELOG.md#&#8203;304-httpswwwgithubcomgoogleapisjava-dlpcomparev303v304-2021-09-13)

[Compare Source](https://togithub.com/googleapis/java-dlp/compare/v3.0.3...v3.0.4)

</details>

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dlp/snippets/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-dlp</artifactId>
-      <version>3.0.3</version>
+      <version>3.0.4</version>
     </dependency>
     <!-- [END dlp_install_without_bom] -->