deps: update dependency com.google.cloud:google-cloud-bigquery to v1.120.0 (#357)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-bigquery](https://togithub.com/googleapis/java-bigquery) | minor | `1.119.0` -> `1.120.0` |

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### Release Notes


googleapis/java-bigquery

### [`v1.120.0`](https://togithub.com/googleapis/java-bigquery/blob/master/CHANGELOG.md#​11200-httpswwwgithubcomgoogleapisjava-bigquerycomparev11190v11200-2020-09-22)

[Compare Source](https://togithub.com/googleapis/java-bigquery/compare/v1.119.0...v1.120.0)

##### Features

-   sql fast path impl ([#​509](https://www.github.com/googleapis/java-bigquery/issues/509)) ([64a7d65](https://www.github.com/googleapis/java-bigquery/commit/64a7d65ff97152c49194f507562266c1ba6f0f3b)), closes [google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/BigQueryException.java#L69-L71](https://www.github.com/google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/BigQueryException.java/issues/L69-L71) [#L69](https://www.github.com/googleapis/java-bigquery/issues/L69)



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samples/install-without-bom/pom.xml

@@ -54,7 +54,7 @@
     <dependency>
       <groupId>com.google.cloudgroupId>
       <artifactId>google-cloud-bigqueryartifactId>
-      <version>1.119.0version>
+      <version>1.120.0version>
       <scope>testscope>
     dependency>
     <dependency>

samples/snapshot/pom.xml

@@ -53,7 +53,7 @@
     <dependency>
       <groupId>com.google.cloudgroupId>
       <artifactId>google-cloud-bigqueryartifactId>
-      <version>1.119.0version>
+      <version>1.120.0version>
       <scope>testscope>
     dependency>
     <dependency>

samples/snippets/pom.xml

@@ -65,7 +65,7 @@
     <dependency>
       <groupId>com.google.cloudgroupId>
       <artifactId>google-cloud-bigqueryartifactId>
-      <version>1.119.0version>
+      <version>1.120.0version>
       <scope>testscope>
     dependency>
     <dependency>