chore(deps): update dependency com.google.cloud:google-cloud-bigtable to v1.26.0 (#856)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-bigtable](https://togithub.com/googleapis/java-bigtable) | `1.25.0` -> `1.26.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/1.26.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/1.26.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/1.26.0/compatibility-slim/1.25.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/1.26.0/confidence-slim/1.25.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.26.0`](https://togithub.com/googleapis/java-bigtable/blob/master/CHANGELOG.md#&#8203;1260-httpswwwgithubcomgoogleapisjava-bigtablecomparev1250v1260-2021-06-03)

[Compare Source](https://togithub.com/googleapis/java-bigtable/compare/v1.25.0...v1.26.0)

##### Features

-   promote stream wait timeouts to deadlines for point reads ([#&#8203;848](https://www.github.com/googleapis/java-bigtable/issues/848)) ([9b3c601](https://www.github.com/googleapis/java-bigtable/commit/9b3c6013fef396fcc923e53c13f73a03a48c9c02))

##### Bug Fixes

-   add back in extraFiles and fix file path ([#&#8203;833](https://www.github.com/googleapis/java-bigtable/issues/833)) ([f914954](https://www.github.com/googleapis/java-bigtable/commit/f91495474cb34e1f178d9362ab0251d364079f6d))
-   exclude protobuf from conformance-tests ([#&#8203;845](https://www.github.com/googleapis/java-bigtable/issues/845)) ([1d89191](https://www.github.com/googleapis/java-bigtable/commit/1d89191a2453b5565aafe72367329eddb36ea90a))
-   Fix the race condition in decay average ([#&#8203;850](https://www.github.com/googleapis/java-bigtable/issues/850)) ([66a9c9e](https://www.github.com/googleapis/java-bigtable/commit/66a9c9ebc520dd20c336a5cf4040912138137be6))
-   revert conformance test version ([#&#8203;846](https://www.github.com/googleapis/java-bigtable/issues/846)) ([b23b0d7](https://www.github.com/googleapis/java-bigtable/commit/b23b0d7a7d8a2b9bed1cdabce420cb6568cf82ef))

##### Dependencies

-   update dependency com.google.cloud:google-cloud-conformance-tests to v0.1.1 ([#&#8203;852](https://www.github.com/googleapis/java-bigtable/issues/852)) ([e1c951c](https://www.github.com/googleapis/java-bigtable/commit/e1c951c549bf455cdd6e997756d9464a1e06dad2))

</details>

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samples/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigtable</artifactId>
-      <version>1.25.0</version>
+      <version>1.26.0</version>
     </dependency>
     <!-- [END bigtable_install_without_bom] -->