deps: update dependency com.google.cloud:google-cloud-channel-bom to v2.1.0 (#1920)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-channel-bom](https://github.com/googleapis/java-channel) | `2.0.1` -> `2.1.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-channel-bom/2.1.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-channel-bom/2.1.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-channel-bom/2.1.0/compatibility-slim/2.0.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-channel-bom/2.1.0/confidence-slim/2.0.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.1.0`](https://github.com/googleapis/java-channel/blob/master/CHANGELOG.md#&#8203;210-httpswwwgithubcomgoogleapisjava-channelcomparev201v210-2021-04-23)

[Compare Source](https://github.com/googleapis/java-channel/compare/v2.0.1...v2.1.0)

##### Features

-   Added legacy_sku field to TransferableSku ([3e0defe](https://github.com/googleapis/java-channel/commit/3e0defedb743a243e78fc307ae325ab939056dde))
-   Adding customer level pubsub events for primary domain verification and primary domain change ([3e0defe](https://github.com/googleapis/java-channel/commit/3e0defedb743a243e78fc307ae325ab939056dde))
-   addition of billing_account field on Plan ([#&#8203;56](https://github.com/googleapis/java-channel/issues/56)) ([fdc2ad6](https://github.com/googleapis/java-channel/commit/fdc2ad62d253f36dcd55c0f3bb69138f4dea29cd))
-   Enabled support for boolean as an allowed parameter value ([3e0defe](https://github.com/googleapis/java-channel/commit/3e0defedb743a243e78fc307ae325ab939056dde))
-   **generator:** update protoc to v3.15.3 ([#&#8203;54](https://github.com/googleapis/java-channel/issues/54)) ([bcece47](https://github.com/googleapis/java-channel/commit/bcece4727fd0f832a29b0f293b1f983cf0af0d8f))

##### Bug Fixes

-   release scripts from issuing overlapping phases ([#&#8203;74](https://github.com/googleapis/java-channel/issues/74)) ([72667e2](https://github.com/googleapis/java-channel/commit/72667e228ddfa96f9e9965b7b63cf2258a3627e3))
-   typo ([#&#8203;72](https://github.com/googleapis/java-channel/issues/72)) ([dc27217](https://github.com/googleapis/java-channel/commit/dc27217a2e32d20c83784dc69bff24598dae25a3))

##### Documentation

-   clarification that valid address lines are required for all customers ([fdc2ad6](https://github.com/googleapis/java-channel/commit/fdc2ad62d253f36dcd55c0f3bb69138f4dea29cd))
-   Update documentation comments to match tone and style with the rest of Cloud documentation ([#&#8203;69](https://github.com/googleapis/java-channel/issues/69)) ([3e0defe](https://github.com/googleapis/java-channel/commit/3e0defedb743a243e78fc307ae325ab939056dde))

##### Dependencies

-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.20.1 ([#&#8203;61](https://github.com/googleapis/java-channel/issues/61)) ([b532007](https://github.com/googleapis/java-channel/commit/b532007fd7afbf0b905e3432a02401b8feaef4a5))
-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.21.0 ([#&#8203;70](https://github.com/googleapis/java-channel/issues/70)) ([93fde13](https://github.com/googleapis/java-channel/commit/93fde137961babee0b099e2e8d8ebcb1c2b1d5c9))
-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.21.1 ([#&#8203;75](https://github.com/googleapis/java-channel/issues/75)) ([5686118](https://github.com/googleapis/java-channel/commit/5686118e7c2b3477d5d1081cfb512b655412418a))
-   update dependency com.google.cloud:google-cloud-shared-dependencies to v1 ([#&#8203;79](https://github.com/googleapis/java-channel/issues/79)) ([84f0ac3](https://github.com/googleapis/java-channel/commit/84f0ac3e8a5f81f1c73beb816f04b64142bc59b7))

##### [2.0.1](https://github.com/googleapis/java-channel/compare/v2.0.0...v2.0.1) (2021-02-25)

##### Dependencies

-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.20.0 ([#&#8203;50](https://github.com/googleapis/java-channel/issues/50)) ([4e08077](https://github.com/googleapis/java-channel/commit/4e08077673eae901d28c21237efd4b9c97f66184))

</details>

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Author: renovate-bot

pom.xml

@@ -245,7 +245,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-channel-bom</artifactId>
-        <version>2.0.1</version>
+        <version>2.1.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>