deps: update dependency com.google.cloud:google-cloud-retail-bom to v2 (#2574)
deps: update dependency com.google.cloud:google-cloud-retail-bom to v2 (#2574)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-retail-bom](https://togithub.com/googleapis/java-retail) | `1.2.1` -> `2.0.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-retail-bom/2.0.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-retail-bom/2.0.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-retail-bom/2.0.0/compatibility-slim/1.2.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-retail-bom/2.0.0/confidence-slim/1.2.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.0.0`](https://togithub.com/googleapis/java-retail/blob/master/CHANGELOG.md#&#8203;200-httpswwwgithubcomgoogleapisjava-retailcomparev121v200-2021-08-12)

[Compare Source](https://togithub.com/googleapis/java-retail/compare/v1.2.1...v2.0.0)

##### ⚠ BREAKING CHANGES

-   release gapic-generator-java v2.0.0 ([#&#8203;169](https://togithub.com/googleapis/java-retail/issues/169))

##### Features

-   release gapic-generator-java v2.0.0 ([#&#8203;169](https://www.togithub.com/googleapis/java-retail/issues/169)) ([0134460](https://www.github.com/googleapis/java-retail/commit/01344601a46bb54597564cb7d10670e8d99fd47b))

##### Dependencies

-   update dependency com.google.cloud:google-cloud-shared-dependencies to v2.0.1 ([#&#8203;170](https://www.togithub.com/googleapis/java-retail/issues/170)) ([dbdbd64](https://www.github.com/googleapis/java-retail/commit/dbdbd64f15166bb3585e25cd96df787a34b3ae98))

##### Documentation

-   Remove HTML tags from Cloud Retail API library docs ([0134460](https://www.github.com/googleapis/java-retail/commit/01344601a46bb54597564cb7d10670e8d99fd47b))
-   **retail:** Quote several literal expressions for better rendering ([0134460](https://www.github.com/googleapis/java-retail/commit/01344601a46bb54597564cb7d10670e8d99fd47b))

##### [1.2.1](https://www.github.com/googleapis/java-retail/compare/v1.2.0...v1.2.1) (2021-08-10)

##### Documentation

-   remove remaining private links ([#&#8203;159](https://www.togithub.com/googleapis/java-retail/issues/159)) ([ec44deb](https://www.github.com/googleapis/java-retail/commit/ec44deba3072f4c7043e051690c4fb37bb535864))

##### Dependencies

-   update dependency com.google.cloud:google-cloud-shared-dependencies to v2 ([#&#8203;161](https://www.togithub.com/googleapis/java-retail/issues/161)) ([0004c12](https://www.github.com/googleapis/java-retail/commit/0004c12c593e0d40f9b72abff6dc4d0a54d9d9c7))

</details>

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