Avoid Gson final-field mutation on modern JDKs - #2031
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Fixes #2030.
Make the Gson-serialized
adyenLibraryfield non-final. Gson already mutates this field during deserialization; on JDK 26 that reflective write emits a final-field mutation warning and is scheduled to require explicit opt-in under JEP 500.The public API remains read-only because no setter is added, and the constructor continues to initialize the SDK name/version.
Verification:
mvn -Dtest=SaleToAcquirerDataSerializerTest test— round trip passes and the final-field warning is gone.mvn test -DskipITs— 617 tests, 0 failures/errors, 4 skips on JDK 26.