GDORIVER-2934 Add list of possible OS and Go dep errors to case 6 (#1535)

Author: prestonvasquez

mongo/integration/client_side_encryption_prose_test.go

@@ -2234,7 +2234,15 @@ func TestClientSideEncryptionProse(t *testing.T) {
 			crypt, err := mongocrypt.NewMongoCrypt(opts)
 			assert.Nil(mt, err, "error in NewMongoCrypt: %v", err)
 			_, err = crypt.GetKmsProviders(context.Background())
-			assert.ErrorContains(mt, err, "Client.Timeout or context cancellation while reading body")
+
+			possibleErrors := []string{
+				"error reading response body: context deadline exceeded",    // <= 1.19 + RHEL & macOS
+				"Client.Timeout or context cancellation while reading body", // > 1.20 on all OS
+			}
+
+			assert.True(t, containsSubstring(possibleErrors, err.Error()),
+				"expected possibleErrors=%v to contain %v, but it didn't",
+				possibleErrors, err.Error())
 		})
 	})