chore(deps): update dependency com.google.cloud:google-cloud-firestor…

…e to v3.21.0 (googleapis#1662)

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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) | `3.20.2` -> `3.21.0` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:google-cloud-firestore/3.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.google.cloud:google-cloud-firestore/3.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.cloud:google-cloud-firestore/3.20.2/3.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.cloud:google-cloud-firestore/3.20.2/3.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v3.21.0`](https://togithub.com/googleapis/java-firestore/blob/HEAD/CHANGELOG.md#3210-2024-04-26)

[Compare Source](https://togithub.com/googleapis/java-firestore/compare/v3.20.2...v3.21.0)

##### Features

-   Add Vector Index API ([4964982](https://togithub.com/googleapis/java-firestore/commit/496498271b31a878910c17954350673beade2bef))
-   Add VectorSearch API ([4964982](https://togithub.com/googleapis/java-firestore/commit/496498271b31a878910c17954350673beade2bef))

##### Bug Fixes

-   **deps:** Update the Java code generator (gapic-generator-java) to 2.39.0 ([#&#8203;1629](https://togithub.com/googleapis/java-firestore/issues/1629)) ([4964982](https://togithub.com/googleapis/java-firestore/commit/496498271b31a878910c17954350673beade2bef))

##### Documentation

-   Allow 14 week backup retention for Firestore daily backups ([4964982](https://togithub.com/googleapis/java-firestore/commit/496498271b31a878910c17954350673beade2bef))
-   Correct BackupSchedule recurrence docs that mentioned specific time of day ([4964982](https://togithub.com/googleapis/java-firestore/commit/496498271b31a878910c17954350673beade2bef))

</details>

---

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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>3.20.2</version>
+  <version>3.21.0</version>
 </dependency>
 
 ```
@@ -57,13 +57,13 @@ implementation 'com.google.cloud:google-cloud-firestore'
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-firestore:3.20.2'
+implementation 'com.google.cloud:google-cloud-firestore:3.21.0'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-firestore" % "3.20.2"
+libraryDependencies += "com.google.cloud" % "google-cloud-firestore" % "3.21.0"
 ```
 <!-- {x-version-update-end} -->
 
@@ -222,7 +222,7 @@ Java is a registered trademark of Oracle and/or its affiliates.
 [kokoro-badge-link-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-firestore/java11.html
 [stability-image]: https://img.shields.io/badge/stability-stable-green
 [maven-version-image]: https://img.shields.io/maven-central/v/com.google.cloud/google-cloud-firestore.svg
-[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-firestore/3.20.2
+[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-firestore/3.21.0
 [authentication]: https://github.com/googleapis/google-cloud-java#authentication
 [auth-scopes]: https://developers.google.com/identity/protocols/oauth2/scopes
 [predefined-iam-roles]: https://cloud.google.com/iam/docs/understanding-roles#predefined_roles

samples/install-without-bom/pom.xml

@@ -30,7 +30,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-firestore</artifactId>
-      <version>3.20.2</version>
+      <version>3.21.0</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>3.20.2</version>
+      <version>3.21.0</version>
     </dependency>
 
     <dependency>