deps: update dependency com.google.cloud:google-cloud-core to v2.0.3 (#768)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-core](https://togithub.com/googleapis/java-core) | `2.0.2` -> `2.0.3` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/2.0.3/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/2.0.3/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/2.0.3/compatibility-slim/2.0.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/2.0.3/confidence-slim/2.0.2)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.0.3`](https://togithub.com/googleapis/java-core/blob/master/CHANGELOG.md#​203-httpswwwgithubcomgoogleapisjava-corecomparev202v203-2021-08-10)

[Compare Source](https://togithub.com/googleapis/java-core/compare/v2.0.2...v2.0.3)

</details>

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samples/install-without-bom/pom.xml

@@ -80,7 +80,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-core</artifactId>
-      <version>2.0.2</version>
+      <version>2.0.3</version>
       <classifier>tests</classifier>
     </dependency>
   </dependencies>

samples/snapshot/pom.xml

@@ -79,7 +79,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-core</artifactId>
-      <version>2.0.2</version>
+      <version>2.0.3</version>
       <classifier>tests</classifier>
     </dependency>
   </dependencies>

samples/snippets/pom.xml

@@ -90,7 +90,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-core</artifactId>
-      <version>2.0.2</version>
+      <version>2.0.3</version>
       <classifier>tests</classifier>
     </dependency>
     <!-- [END_EXCLUDE] -->