Fix: Ensure UTF-8 encoding in Maven build to prevent test failure in CityNormalizeTest

[ivyan26733]

Added <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> to pom.xml
to resolve a character encoding mismatch in the test where 'San José' was misinterpreted
due to default system encoding on some environments.

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@satwikareddy3 has imported this pull request. If you are a Meta employee, you can view this in D80362693.