Remove credentials from source repo

[jeffscottbrown]

At https://github.com/oss-slu/Pi4Micronaut/blob/a1feb7122dd89032fd1c12c24d9e512d73efc018/micronautpi4j-utils/gradle.properties are presently sonatype credentials.

The build should probably be reconfigured so those credentials are not kept in source code. For GitHub actions, configuring those as GitHub Secrets (docs.github.com/en/actions/security-guides/using-secrets-in-github-actions) might be the best option.

[ruthvikm]

This issue was resolved