deps: update dependency com.google.cloud:google-cloud-core to v2.8.16 (…

…#823)

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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) | `2.8.15` -> `2.8.16` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/2.8.16/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/2.8.16/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/2.8.16/compatibility-slim/2.8.15)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/2.8.16/confidence-slim/2.8.15)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.8.16`](https://togithub.com/googleapis/java-core/blob/HEAD/CHANGELOG.md#&#8203;2816-httpsgithubcomgoogleapisjava-corecomparev2815v2816-2022-09-26)

##### Dependencies

-   Update dependency org.threeten:threetenbp to v1.6.2 ([#&#8203;929](https://togithub.com/googleapis/java-core/issues/929)) ([2f797f9](https://togithub.com/googleapis/java-core/commit/2f797f990eacc112dd982e7a8f9155bc229b7bf3))

</details>

---

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java-accessapproval/samples/install-without-bom/pom.xml

@@ -48,7 +48,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-core</artifactId>
-      <version>2.8.15</version>
+      <version>2.8.16</version>
       <classifier>tests</classifier>
     </dependency>
   </dependencies>

java-accessapproval/samples/snapshot/pom.xml

@@ -46,7 +46,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-core</artifactId>
-      <version>2.8.15</version>
+      <version>2.8.16</version>
       <classifier>tests</classifier>
     </dependency>
   </dependencies>

java-accessapproval/samples/snippets/pom.xml

@@ -59,7 +59,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-core</artifactId>
-      <version>2.8.15</version>
+      <version>2.8.16</version>
       <classifier>tests</classifier>
     </dependency>
   </dependencies>