fix(build): replace GPG key with new one

[MDarmawan]

Title: PR Title

Short Description: Short explanation/description of PR (or issue/task)

Checklist

• I have performed a self-review of my changes
• My code/changes are commented (especially hard-to-understand areas)
• I have written/updated new unit tests for the core changes or new/updated tests are not necessary
• I have posted test results from local tests or made sure the TravisCI tests succeeded
• I have made changes to the examples in examples/kp-sdk-example where relevant, and tested those changes
  - run mvn clean install to build the sdk, then run mvn clean install in the examples/kp-sdk-example directory to build the examples.
  - To run the example jar's examples, use java -jar kp-sdk-example-1.0-SNAPSHOT.jar $EXAMPLE_NAME

Changes

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Test Results

Test results may be run by the TravisCI build. If so, please verify whether they are running properly.

Dependencies

Is anything changing with respect to dependencies (the pom.xml or gradle file)? Explain that here and why they were changed.

[MDarmawan]

🎉 This PR is included in version 1.0.3 🎉

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