deps: update dependency com.google.cloud:google-cloud-bigquerystorage-bom to v1.4.0 (#762)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-bigquerystorage-bom](https://github.com/googleapis/java-bigquerystorage) | minor | `1.3.1` -> `1.4.0` |

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### Release Notes

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

### [`v1.4.0`](https://github.com/googleapis/java-bigquerystorage/blob/master/CHANGELOG.md#&#8203;140-httpswwwgithubcomgoogleapisjava-bigquerystoragecomparev131v140-2020-08-07)

[Compare Source](https://github.com/googleapis/java-bigquerystorage/compare/v1.3.1...v1.4.0)

##### Features

-   add JsonStreamWriter ([#&#8203;475](https://github.com/googleapis/java-bigquerystorage/issues/475)) ([341bf99](https://github.com/googleapis/java-bigquerystorage/commit/341bf99d47d788ebabaa1ce775d1a4f527ee46b0))

##### Bug Fixes

-   enum value conflict in generated ProtoSchema descriptor. ([#&#8203;469](https://github.com/googleapis/java-bigquerystorage/issues/469)) ([3e1382f](https://github.com/googleapis/java-bigquerystorage/commit/3e1382f247de5e6ee8727130280e34fa01d3c088)), closes [#&#8203;464](https://github.com/googleapis/java-bigquerystorage/issues/464)

##### Dependencies

-   update dependency com.fasterxml.jackson.core:jackson-core to v2.11.2 ([#&#8203;461](https://github.com/googleapis/java-bigquerystorage/issues/461)) ([36b368a](https://github.com/googleapis/java-bigquerystorage/commit/36b368a14bb7d45f92af23bc0dd6fe08ad79b085))
-   update dependency com.google.cloud:google-cloud-bigquery to v1.116.9 ([#&#8203;473](https://github.com/googleapis/java-bigquerystorage/issues/473)) ([b4ba055](https://github.com/googleapis/java-bigquerystorage/commit/b4ba055a809dbe414e8e19d377b8257d0b5446d6))
-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.8.5 ([#&#8203;467](https://github.com/googleapis/java-bigquerystorage/issues/467)) ([35c65d4](https://github.com/googleapis/java-bigquerystorage/commit/35c65d466d44d01e6f7626ef7cf1aa0e9f3ff0f3))

##### [1.3.1](https://github.com/googleapis/java-bigquerystorage/compare/v1.3.0...v1.3.1) (2020-07-31)

##### Dependencies

-   update dependency com.google.cloud:google-cloud-bigquery to v1.116.7 ([#&#8203;441](https://github.com/googleapis/java-bigquerystorage/issues/441)) ([abc1971](https://github.com/googleapis/java-bigquerystorage/commit/abc197169b5f04e0eafb486db0d9038903cefe61))

</details>

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pom.xml

@@ -244,7 +244,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-bigquerystorage-bom</artifactId>
-        <version>1.3.1</version>
+        <version>1.4.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>