deps: update dependency com.google.cloud:google-cloud-texttospeech-bom to v1.2.0 (#789)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-texttospeech-bom](https://github.com/googleapis/java-texttospeech) | minor | `1.1.0` -> `1.2.0` |

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### Release Notes

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

### [`v1.2.0`](https://github.com/googleapis/java-texttospeech/blob/master/CHANGELOG.md#&#8203;120-httpswwwgithubcomgoogleapisjava-texttospeechcomparev110v120-2020-08-10)

[Compare Source](https://github.com/googleapis/java-texttospeech/compare/v1.1.0...v1.2.0)

##### Features

-   Support MULAW audio encoding feat: Support MP3_64_KBPS audio encoding feat: Support timepointing via SSML <mark> tag ([#&#8203;198](https://github.com/googleapis/java-texttospeech/issues/198)) ([4c17321](https://github.com/googleapis/java-texttospeech/commit/4c1732132690363e5a1aece52f06c01defd1f615))

##### Documentation

-   escape `*` characters in comments ([#&#8203;205](https://github.com/googleapis/java-texttospeech/issues/205)) ([a785744](https://github.com/googleapis/java-texttospeech/commit/a78574490bc3fbd3c709d8edc0781a7d335029bf))

##### Dependencies

-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.8.2 ([#&#8203;192](https://github.com/googleapis/java-texttospeech/issues/192)) ([f9b0ea2](https://github.com/googleapis/java-texttospeech/commit/f9b0ea2e87baaf0b7cbb1941c712ecec26a70189))
-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.8.6 ([#&#8203;195](https://github.com/googleapis/java-texttospeech/issues/195)) ([b4bcfe7](https://github.com/googleapis/java-texttospeech/commit/b4bcfe77744ae3c5471ca0db0c3dd0c8c5b3981d))

</details>

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Author: renovate-bot

pom.xml

@@ -564,7 +564,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-texttospeech-bom</artifactId>
-        <version>1.1.0</version>
+        <version>1.2.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>