chore(deps): update dependency com.google.cloud:google-cloud-bigtable to v2 (#945)

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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) | `1.27.3` -> `2.0.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/2.0.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/2.0.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/2.0.0/compatibility-slim/1.27.3)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/2.0.0/confidence-slim/1.27.3)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.0.0`](https://togithub.com/googleapis/java-bigtable/blob/master/CHANGELOG.md#​200-httpswwwgithubcomgoogleapisjava-bigtablecomparev1273v200-2021-08-09)

[Compare Source](https://togithub.com/googleapis/java-bigtable/compare/v1.27.3...v2.0.0)

##### ⚠ BREAKING CHANGES

*   release gapic-generator-java v2.0.0 ([#​938](https://togithub.com/googleapis/java-bigtable/issues/938))
*   update java compile to 1.8 (update google-cloud-shared-config … ([#​939](https://togithub.com/googleapis/java-bigtable/issues/939))

##### Features

*   gapic-generator-java v1.0.12, mtls support ([#​871](https://www.togithub.com/googleapis/java-bigtable/issues/871)) ([3ec05d4](https://www.togithub.com/googleapis/java-bigtable/commit/3ec05d4dff8ee3799dd799ecf659610de031564a))
*   release gapic-generator-java v2.0.0 ([#​938](https://www.togithub.com/googleapis/java-bigtable/issues/938)) ([d2456e4](https://www.togithub.com/googleapis/java-bigtable/commit/d2456e4b014f714c87ff5ad414b5fabd0631e912))
*   update java compile to 1.8 (update google-cloud-shared-config … ([#​939](https://www.togithub.com/googleapis/java-bigtable/issues/939)) ([57cddee](https://www.togithub.com/googleapis/java-bigtable/commit/57cddee445dec91a8bb96127ee7db947a1e13a7d))

##### Dependencies

*   fix UpperBoundsDep check for checker-qual ([#​941](https://www.togithub.com/googleapis/java-bigtable/issues/941)) ([1d7c224](https://www.togithub.com/googleapis/java-bigtable/commit/1d7c224bd46f8ab576645e5d722ac595ab875406))

##### [1.27.3](https://www.togithub.com/googleapis/java-bigtable/compare/v1.27.2...v1.27.3) (2021-07-19)

##### Bug Fixes

*   client.close() should wait until the channels are terminated before shutting down the executor ([#​916](https://www.togithub.com/googleapis/java-bigtable/issues/916)) ([914f0cc](https://www.togithub.com/googleapis/java-bigtable/commit/914f0cc4a928974e14b2ab49b848f757862ad140))

##### [1.27.2](https://www.togithub.com/googleapis/java-bigtable/compare/v1.27.1...v1.27.2) (2021-07-01)

##### Bug Fixes

*   jwt authentication on batch-bigtable.googleapis.com ([#​892](https://www.togithub.com/googleapis/java-bigtable/issues/892)) ([d2ca9c6](https://www.togithub.com/googleapis/java-bigtable/commit/d2ca9c62f3fcb9c79c97ef8a73bad3a0e7555afc))

##### [1.27.1](https://www.togithub.com/googleapis/java-bigtable/compare/v1.27.0...v1.27.1) (2021-06-30)

##### Bug Fixes

*   Add `shopt -s nullglob` to dependencies script ([#​884](https://www.togithub.com/googleapis/java-bigtable/issues/884)) ([8b971a2](https://www.togithub.com/googleapis/java-bigtable/commit/8b971a2510685be336b0dd19fc048905b56906e3))

##### Dependencies

*   update dependency com.google.cloud:google-cloud-shared-dependencies to v1.4.0 ([#​889](https://www.togithub.com/googleapis/java-bigtable/issues/889)) ([8b6754f](https://www.togithub.com/googleapis/java-bigtable/commit/8b6754fb1fbdca43a327e3f253be076eb0c2cd2f))

</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>1.27.3</version>
+      <version>2.0.0</version>
     </dependency>
     <!-- [END bigtable_install_without_bom] -->