Old Netty version for Appdistribution

### [READ] Step 1: Are you in the right place?
Yes
### [REQUIRED] Step 2: Describe your environment

- Android Studio version: **\Android Studio Otter 3 Feature Drop | 2025.2.3**
- Firebase Component: **App Distribution**
- Component version: **34.8.0 BOM**
appDistribution Gradle 5.2.0

### [REQUIRED] Step 3: Describe the problem
Security scanners detected a vulnerability inside CVE-2025-58057 com.google.firebase.appdistribution.gradle.plugin.*. Suggested update to newer version.

#### Steps to reproduce:

#### Relevant Code:

```
./gradlew buildEnvironment
| +--- io.grpc:grpc-netty:1.69.1
| | +--- io.grpc:grpc-api:1.69.1 (*)
| | +--- io.netty:netty-codec-http2:4.1.110.Final