chore: Up to c2pa-v0.75.19 (#226)

* chore: Up to c2pa-v0.75.18

* chore: Update test_unit_tests.py to check c2pa-v0.75.18

* Update test_unit_tests.py

* Update c2pa-native-version.txt

* Update test_unit_tests.py

Author: tmathern

c2pa-native-version.txt

@@ -1 +1 @@
-c2pa-v0.75.16
+c2pa-v0.75.19

tests/test_unit_tests.py

@@ -67,8 +67,8 @@ def load_test_settings_json():
 
 class TestC2paSdk(unittest.TestCase):
     def test_sdk_version(self):
-        # This test verifies the native libraries used match the expected version
-        self.assertIn("0.75.16", sdk_version())
+        # This test verifies the native libraries used match the expected version.
+        self.assertIn("0.75.19", sdk_version())
 
 
 class TestReader(unittest.TestCase):