chore(deps): update dependency com.google.cloud:google-cloud-firestore to v3.20.1 (#1654)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-firestore](https://togithub.com/googleapis/java-firestore) | `3.20.0` -> `3.20.1` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:google-cloud-firestore/3.20.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.google.cloud:google-cloud-firestore/3.20.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.cloud:google-cloud-firestore/3.20.0/3.20.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.cloud:google-cloud-firestore/3.20.0/3.20.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v3.20.1`](https://togithub.com/googleapis/java-firestore/blob/HEAD/CHANGELOG.md#3201-2024-04-18)

##### Dependencies

-   Update beam.version to v2.55.1 ([#&#8203;1643](https://togithub.com/googleapis/java-firestore/issues/1643)) ([88ce6c3](https://togithub.com/googleapis/java-firestore/commit/88ce6c3c1855c527243fcdf236d8210e8ecb3610))

</details>

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Author: renovate-bot

README.md

@@ -42,7 +42,7 @@ If you are using Maven without the BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-firestore</artifactId>
-  <version>3.20.0</version>
+  <version>3.20.1</version>
 </dependency>
 
 ```

samples/install-without-bom/pom.xml

@@ -30,7 +30,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-firestore</artifactId>
-      <version>3.20.0</version>
+      <version>3.20.1</version>
     </dependency>
     <!-- [END firestore_install_without_bom] -->
 

samples/snapshot/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-firestore</artifactId>
-      <version>3.20.0</version>
+      <version>3.20.1</version>
     </dependency>
 
     <dependency>