chore: Remove duplicate maven-surefire-plugin

[vorburger]

Fixes

This fixes the following message seen when building this project:

$ mvn test
[INFO] Scanning for projects...
[WARNING]
[WARNING] Some problems were encountered while building the effective model for com.twilio.sdk:twilio:jar:11.1.0 [WARNING] 'build.plugins.plugin.(groupId:artifactId)' must be unique but found duplicate declaration of plugin org.apache.maven.plugins:maven-surefire-plugin @ line 447, column 15 [WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build. [WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects. [WARNING]

Checklist

• I acknowledge that all my contributions will be made under the project's license
• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the Contribution Guidelines and my PR follows them
• I have titled the PR appropriately
• I have updated my branch with the main branch
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation about the functionality in the appropriate .md file
• I have added inline documentation to the code I modified

If you have questions, please file a support ticket, or create a GitHub Issue in this repository.

[vorburger]

@kridai @manisha1997 @tiwarishubham635 please review and merge?