deps: update dependency com.google.cloud:google-cloud-bigquery to v1.122.2 (#418)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-bigquery](https://togithub.com/googleapis/java-bigquery) | patch | `1.122.1` -> `1.122.2` |

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### Release Notes


googleapis/java-bigquery

### [`v1.122.2`](https://togithub.com/googleapis/java-bigquery/blob/master/CHANGELOG.md#​11222-httpswwwgithubcomgoogleapisjava-bigquerycomparev11221v11222-2020-10-08)

[Compare Source](https://togithub.com/googleapis/java-bigquery/compare/v1.122.1...v1.122.2)



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samples/install-without-bom/pom.xml

@@ -54,7 +54,7 @@
     <dependency>
       <groupId>com.google.cloudgroupId>
       <artifactId>google-cloud-bigqueryartifactId>
-      <version>1.122.1version>
+      <version>1.122.2version>
       <scope>testscope>
     dependency>
     <dependency>

samples/snapshot/pom.xml

@@ -53,7 +53,7 @@
     <dependency>
       <groupId>com.google.cloudgroupId>
       <artifactId>google-cloud-bigqueryartifactId>
-      <version>1.122.1version>
+      <version>1.122.2version>
       <scope>testscope>
     dependency>
     <dependency>

samples/snippets/pom.xml

@@ -65,7 +65,7 @@
     <dependency>
       <groupId>com.google.cloudgroupId>
       <artifactId>google-cloud-bigqueryartifactId>
-      <version>1.122.1version>
+      <version>1.122.2version>
       <scope>testscope>
     dependency>
     <dependency>