Fixed sandbox FHIRv3 URL.

Author: jadudm

dev-local/.env.local.example

@@ -40,7 +40,7 @@ DJANGO_SECRET_KEY=replace-me-with-real-secret
 FHIR_URL_TEST="https://test.fhir.bfd.cmscloud.local"
 FHIR_URL_V3_TEST="https://test.fhirv3.bfd.cmscloud.local"
 FHIR_URL_SBX="https://prod-sbx.fhir.bfd.cmscloud.local"
-FHIR_URL_V3_SBX="https://prod-sbx.fhirv3.bfd.cmscloud.local"
+FHIR_URL_V3_SBX="https://sandbox.fhirv3.bfd.cmscloud.local"
 
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