Fix failing test for PHP 7.4

.circleci/config.yml

@@ -107,6 +107,16 @@ jobs:
     docker:
       - image: circleci/php:7.3-zts-node
 
+  php74:
+    <<: *unit-config
+    docker:
+      - image: circleci/php:7.4-node
+
+  php74-zts:
+    <<: *unit-config
+    docker:
+      - image: circleci/php:7.4-zts-node
+
   php71-32bit:
     <<: *unit-config
     docker:
@@ -226,6 +236,8 @@ workflows:
       - php72-zts
       - php73
       - php73-zts
+      - php74
+      - php74-zts
       - php71-32bit
       - php71-debug
-      - integration
+      - integration

ext/tests/name_uncastable_object.phpt

@@ -19,4 +19,8 @@ var_dump($span->name());
 
 ?>
 --EXPECTF--
-%s fatal error: Object of class UncastableObject could not be converted to string in %s/name_uncastable_object.php on line %d
+Fatal error: %s: Object of class UncastableObject could not be converted to string in %s/name_uncastable_object.php:%d
+Stack trace:
+#0 %s/name_uncastable_object.php(%d): opencensus_trace_begin('foo', Array)
+#1 {main}
+  thrown in %s/name_uncastable_object.php on line %d