Fixes:
* map_validator: make sure 'object' name is a str [1540](https://github.com/opencybersecurityalliance/stix-shifter/pull/1540)
Dependency update:
* update stix2-validator library to 3.1.4 [1542](https://github.com/opencybersecurityalliance/stix-shifter/pull/1542)
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