deps: update bigtable.version to v1.20.1 (#2843)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-bigtable-deps-bom](https://github.com/googleapis/java-bigtable) | `1.20.0` -> `1.20.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable-deps-bom/1.20.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable-deps-bom/1.20.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable-deps-bom/1.20.1/compatibility-slim/1.20.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable-deps-bom/1.20.1/confidence-slim/1.20.0)](https://docs.renovatebot.com/merge-confidence/) |
| [com.google.cloud:google-cloud-bigtable-bom](https://github.com/googleapis/java-bigtable) | `1.20.0` -> `1.20.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable-bom/1.20.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable-bom/1.20.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable-bom/1.20.1/compatibility-slim/1.20.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable-bom/1.20.1/confidence-slim/1.20.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.20.1`](https://github.com/googleapis/java-bigtable/blob/master/CHANGELOG.md#&#8203;1201-httpswwwgithubcomgoogleapisjava-bigtablecomparev1200v1201-2021-02-22)

[Compare Source](https://github.com/googleapis/java-bigtable/compare/v1.20.0...v1.20.1)

</details>

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pom.xml

@@ -56,7 +56,7 @@ limitations under the License.
     <compileSource.1.8>1.8</compileSource.1.8>
 
     <!-- core dependency versions -->
-    <bigtable.version>1.20.0</bigtable.version>
+    <bigtable.version>1.20.1</bigtable.version>
     <dropwizard.metrics.version>3.2.6</dropwizard.metrics.version>
     <!--  keeping at this version to align with hbase-->
     <slf4j.version>1.7.25</slf4j.version>