chore: update copyright headers

cedar-policy / cedar-java

Java bindings for the Cedar language

https://www.cedarpolicy.com

Apache License 2.0

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Closed khieta closed 3 months ago

khieta commented 3 months ago

Issue #, if available:

Description of changes:

Updates copyright headers to match the cedar and cedar-spec repositories (e.g., see cedar#790)
Adds the header to some files we missed.