Bump dropmqttapi to 1.0.3

Proposed change

Bump dropmqttapi package to 1.0.3. This lays the groundwork for adding a new DROP product to the drop_connect integration. Link to package changes: https://github.com/ChandlerSystems/dropmqttapi/commit/4a42b91150f565f34fed22d7b312c7389e47a5da

https://github.com/ChandlerSystems/dropmqttapi/compare/v1.0.2...v1.0.3

Type of change

[x] Dependency upgrade
[ ] Bugfix (non-breaking change which fixes an issue)
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[ ] New feature (which adds functionality to an existing integration)
[ ] Deprecation (breaking change to happen in the future)
[ ] Breaking change (fix/feature causing existing functionality to break)
[ ] Code quality improvements to existing code or addition of tests

Additional information

This PR fixes or closes issue: fixes #
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Hey there @chandlersystems, mind taking a look at this pull request as it has been labeled with an integration (drop_connect) you are listed as a code owner for? Thanks!

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