deps: update dependency com.google.cloud:google-cloud-memcache-bom to v1.0.4 (#1894)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-memcache-bom](https://github.com/googleapis/java-memcache) | `1.0.3` -> `1.0.4` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-memcache-bom/1.0.4/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-memcache-bom/1.0.4/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-memcache-bom/1.0.4/compatibility-slim/1.0.3)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-memcache-bom/1.0.4/confidence-slim/1.0.3)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.0.4`](https://github.com/googleapis/java-memcache/blob/master/CHANGELOG.md#&#8203;104-httpswwwgithubcomgoogleapisjava-memcachecomparev103v104-2021-04-23)

[Compare Source](https://github.com/googleapis/java-memcache/compare/v1.0.3...v1.0.4)

</details>

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Author: renovate-bot

pom.xml

@@ -400,7 +400,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-memcache-bom</artifactId>
-        <version>1.0.3</version>
+        <version>1.0.4</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>