build(deps): update dependency com.google.cloud:google-cloud-shared-config to v0.8.0 (#159)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-shared-config](https://togithub.com/googleapis/java-shared-config) | minor | `0.6.0` -> `0.8.0` |

---

### Release Notes

<details>
<summary>googleapis/java-shared-config</summary>

### [`v0.8.0`](https://togithub.com/googleapis/java-shared-config/blob/master/CHANGELOG.md#&#8203;080-httpswwwgithubcomgoogleapisjava-shared-configcomparev070v080-2020-06-10)

[Compare Source](https://togithub.com/googleapis/java-shared-config/compare/v0.7.0...v0.8.0)

##### Features

-   revert "feat: mark auto-value-annotations scope as provided" ([#&#8203;154](https://www.github.com/googleapis/java-shared-config/issues/154)) ([88afb4e](https://www.github.com/googleapis/java-shared-config/commit/88afb4e7c57cb6e00929c098135314a926d9da30))

### [`v0.7.0`](https://togithub.com/googleapis/java-shared-config/blob/master/CHANGELOG.md#&#8203;070-httpswwwgithubcomgoogleapisjava-shared-configcomparev060v070-2020-06-10)

[Compare Source](https://togithub.com/googleapis/java-shared-config/compare/v0.6.0...v0.7.0)

##### Features

-   mark auto-value-annotations scope as provided ([#&#8203;151](https://www.github.com/googleapis/java-shared-config/issues/151)) ([44ea4cb](https://www.github.com/googleapis/java-shared-config/commit/44ea4cbbf92b4ad35ffaffb7a01a1bce05063daf))

##### Bug Fixes

-   lock the google-java-format version used by formatter plugin ([#&#8203;149](https://www.github.com/googleapis/java-shared-config/issues/149)) ([d58c054](https://www.github.com/googleapis/java-shared-config/commit/d58c05437a4ea8767db2bebfcc405ec77aeb9705))

</details>

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google-cloud-datastore-bom/pom.xml

@@ -8,7 +8,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-shared-config</artifactId>
-    <version>0.6.0</version>
+    <version>0.8.0</version>
   </parent>
 
   <name>Google Cloud datastore BOM</name>

pom.xml

@@ -14,7 +14,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-shared-config</artifactId>
-    <version>0.6.0</version>
+    <version>0.8.0</version>
   </parent>
 
   <developers>