deps: update dependency com.google.cloud:google-cloud-dialogflow-bom …

…to v2.2.0 (#810)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-dialogflow-bom](https://togithub.com/googleapis/java-dialogflow) | minor | `2.1.0` -> `2.2.0` |

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### Release Notes

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

### [`v2.2.0`](https://togithub.com/googleapis/java-dialogflow/blob/master/CHANGELOG.md#&#8203;220-httpswwwgithubcomgoogleapisjava-dialogflowcomparev210v220-2020-08-10)

[Compare Source](https://togithub.com/googleapis/java-dialogflow/compare/v2.1.0...v2.2.0)

##### Features

-   **v2beta1:** add Location parent to Environment resource ([#&#8203;243](https://www.github.com/googleapis/java-dialogflow/issues/243)) ([e80418c](https://www.github.com/googleapis/java-dialogflow/commit/e80418c6f4095404abb5e7a6861e42db641a561e))
-   added support for custom content types ([#&#8203;250](https://www.github.com/googleapis/java-dialogflow/issues/250)) ([f06e8af](https://www.github.com/googleapis/java-dialogflow/commit/f06e8aff54ff7d494793a30860d48141455be5f0))

##### Bug Fixes

-   update grpc config for retry ([#&#8203;230](https://www.github.com/googleapis/java-dialogflow/issues/230)) ([4447393](https://www.github.com/googleapis/java-dialogflow/commit/4447393cd9a4aa2b9ad31cad31e7aca74aca32ad))

##### Dependencies

-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.8.2 ([#&#8203;240](https://www.github.com/googleapis/java-dialogflow/issues/240)) ([c871b9b](https://www.github.com/googleapis/java-dialogflow/commit/c871b9bb6f765f42a4d77b2088e4205f19d10603))
-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.8.3 ([#&#8203;245](https://www.github.com/googleapis/java-dialogflow/issues/245)) ([2897483](https://www.github.com/googleapis/java-dialogflow/commit/2897483bd41e21842ccd9b944d28c7a07138f085))
-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.8.6 ([#&#8203;254](https://www.github.com/googleapis/java-dialogflow/issues/254)) ([05369d5](https://www.github.com/googleapis/java-dialogflow/commit/05369d5fb93092f561083c69a025a05770dc1c00))

##### Documentation

-   more detailed docs on APIs such as Environment, Intents, Sessions. ([#&#8203;247](https://www.github.com/googleapis/java-dialogflow/issues/247)) ([56a3db8](https://www.github.com/googleapis/java-dialogflow/commit/56a3db83aa1e27e8be2170502a1b1db4f10423c5))

</details>

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pom.xml

@@ -333,7 +333,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-dialogflow-bom</artifactId>
-        <version>2.1.0</version>
+        <version>2.2.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>