fix(Country): add missing ISO 3166-1 alpha-2 country codes

[yvasyliev]

Description

Add missing ISO 3166-1 alpha-2 country codes.

Related Issue

Closes #204

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactoring
• Other (please describe):

Checklist

• My code follows the project’s code style and conventions
• I have added or updated Javadoc for public classes and methods
• I have added or updated unit tests as needed
• All tests pass locally (./gradlew build or gradlew.bat build on Windows)
• I have not committed any secrets (passwords, API keys, etc.)

How Has This Been Tested?

Tested with the integration test.

Additional Information

N/A

[gitguardian]

️✅ There are no secrets present in this pull request anymore.

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[yvasyliev]

False positive - not a real secret

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Job Summary for Gradle

PR Build :: pr-build

Gradle Root Project	Requested Tasks	Gradle Version	Build Outcome	Build Scan®
dz4j	build sonar	9.6.1	✅