Fix tests

Author: ondrejmirtes

tests/PHPStan/Levels/data/stringOffsetAccess-9.json

@@ -4,19 +4,39 @@
         "line": 39,
         "ignorable": true
     },
+    {
+        "message": "Parameter #1 (mixed) of echo cannot be converted to string.",
+        "line": 39,
+        "ignorable": true
+    },
     {
         "message": "Cannot access offset 'foo' on mixed.",
         "line": 43,
         "ignorable": true
     },
+    {
+        "message": "Parameter #1 (mixed) of echo cannot be converted to string.",
+        "line": 43,
+        "ignorable": true
+    },
     {
         "message": "Cannot access offset 12.34 on mixed.",
         "line": 47,
         "ignorable": true
     },
+    {
+        "message": "Parameter #1 (mixed) of echo cannot be converted to string.",
+        "line": 47,
+        "ignorable": true
+    },
     {
         "message": "Cannot access offset int|object on mixed.",
         "line": 51,
         "ignorable": true
+    },
+    {
+        "message": "Parameter #1 (mixed) of echo cannot be converted to string.",
+        "line": 51,
+        "ignorable": true
     }
 ]