deps: update dependency com.google.cloud:google-cloud-bigtable-bom to v2.70.1 (#7302)

This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Adoption](https://docs.renovatebot.com/merge-confidence/) | [Passing](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-bigtable-bom](https://redirect.github.com/googleapis/java-bigtable) | `2.70.0` -> `2.70.1` | ![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:google-cloud-bigtable-bom/2.70.1?slim=true) | ![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.google.cloud:google-cloud-bigtable-bom/2.70.1?slim=true) | ![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.cloud:google-cloud-bigtable-bom/2.70.0/2.70.1?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.cloud:google-cloud-bigtable-bom/2.70.0/2.70.1?slim=true) |

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### Release Notes

<details>
<summary>googleapis/java-bigtable (com.google.cloud:google-cloud-bigtable-bom)</summary>

### [`v2.70.1`](https://redirect.github.com/googleapis/java-bigtable/blob/HEAD/CHANGELOG.md#2701-2025-12-12)

[Compare Source](https://redirect.github.com/googleapis/java-bigtable/compare/v2.70.0...v2.70.1)

##### Dependencies

- Update shared dependencies ([#&#8203;2734](https://redirect.github.com/googleapis/java-bigtable/issues/2734)) ([2823705](https://redirect.github.com/googleapis/java-bigtable/commit/28237059edaa20028ea35a1903bdee8c02885260))

</details>

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Author: renovate-bot

google-cloud-bom/pom.xml

@@ -186,7 +186,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-bigtable-bom</artifactId>
-        <version>2.70.0</version>
+        <version>2.70.1</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>