deps: update dependency com.google.cloud:google-cloud-bigquery to v1.124.3 (#493)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-bigquery](https://togithub.com/googleapis/java-bigquery) | patch | `1.124.2` -> `1.124.3` |

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### Release Notes

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

### [`v1.124.3`](https://togithub.com/googleapis/java-bigquery/blob/master/CHANGELOG.md#&#8203;11243-httpswwwgithubcomgoogleapisjava-bigquerycomparev11242v11243-2020-11-10)

[Compare Source](https://togithub.com/googleapis/java-bigquery/compare/v1.124.2...v1.124.3)

</details>

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samples/install-without-bom/pom.xml

@@ -53,7 +53,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigquery</artifactId>
-      <version>1.124.2</version>
+      <version>1.124.3</version>
       <scope>test</scope>
     </dependency>
     <dependency>

samples/snapshot/pom.xml

@@ -53,7 +53,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigquery</artifactId>
-      <version>1.124.2</version>
+      <version>1.124.3</version>
       <scope>test</scope>
     </dependency>
     <dependency>

samples/snippets/pom.xml

@@ -65,7 +65,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigquery</artifactId>
-      <version>1.124.2</version>
+      <version>1.124.3</version>
       <scope>test</scope>
     </dependency>
     <dependency>