fix(deps): update dependency com.google.api.grpc:grpc-google-cloud-di…

…alogflow-v2 to v4.8.1 (#8311)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.api.grpc:grpc-google-cloud-dialogflow-v2](https://togithub.com/googleapis/java-dialogflow/grpc-google-cloud-dialogflow-v2) ([source](https://togithub.com/googleapis/java-dialogflow)) | `4.8.1-SNAPSHOT` -> `4.8.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-cloud-dialogflow-v2/4.8.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-cloud-dialogflow-v2/4.8.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-cloud-dialogflow-v2/4.8.1/compatibility-slim/4.8.1-SNAPSHOT)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-cloud-dialogflow-v2/4.8.1/confidence-slim/4.8.1-SNAPSHOT)](https://docs.renovatebot.com/merge-confidence/) |

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java-dialogflow/google-cloud-dialogflow-bom/pom.xml

@@ -63,7 +63,7 @@
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-dialogflow-v2</artifactId>
-        <version>4.8.1-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-dialogflow-v2:current} -->
+        <version>4.8.1</version><!-- {x-version-update:grpc-google-cloud-dialogflow-v2:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>

java-dialogflow/pom.xml

@@ -76,7 +76,7 @@
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-dialogflow-v2</artifactId>
-        <version>4.8.1-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-dialogflow-v2:current} -->
+        <version>4.8.1</version><!-- {x-version-update:grpc-google-cloud-dialogflow-v2:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>