chore(deps): update dependency com.google.cloud:google-cloud-storage-transfer to v1.2.1 (#179)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-storage-transfer](https://github.com/googleapis/java-storage-transfer) | `1.2.0` -> `1.2.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-storage-transfer/1.2.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-storage-transfer/1.2.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-storage-transfer/1.2.1/compatibility-slim/1.2.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-storage-transfer/1.2.1/confidence-slim/1.2.0)](https://docs.renovatebot.com/merge-confidence/) |

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java-storage-transfer/samples/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-storage-transfer</artifactId>
-      <version>1.2.0</version>
+      <version>1.2.1</version>
     </dependency>
     <!-- [END storage-transfer_install_without_bom] -->
 

java-storage-transfer/samples/snapshot/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-storage-transfer</artifactId>
-      <version>1.2.0</version>
+      <version>1.2.1</version>
     </dependency>
   <!-- {x-version-update-end} -->
 

java-storage-transfer/samples/snippets/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-storage-transfer</artifactId>
-      <version>1.2.0</version>
+      <version>1.2.1</version>
     </dependency>
 
     <dependency>