fix: set sdk version to 34

[mhuynh5757]

Submission Checklist

• [x] The README.md reflects new features
• [x] The CHANGELOG.md reflects any feature, bug fixes, or known issues made in the source code
• [x] ~New unit tests and integration tests have beed added~
• [x] Code coverage is more or equal to the previous coverage
• [x] A visual inspection of the Files changed tab was made prior to submitting the pull request ensuring the style guide was followed
• [ ] CI pipeline is green
• [x] ~Included screenshot if necessary~

Description

This PR sets the Android SDK version to 34 to facilitate easier Play Store publishing.

Breakdown

• Set SDK versions to 34.

Validation

• CI builds and passes.
• Local environment builds and passes basic testing.

Additional Notes

N/A

Contributing to Twilio

All third-party contributors acknowledge that any contributions they provide will be made under the same open-source license that the open-source project is provided under.

• [x] I acknowledge that all my contributions will be made under the project's license.