Update error expectations for libmongoc 2.1

Author: jmikola

tests/manager/manager-ctor-006.phpt

@@ -14,5 +14,5 @@ echo throws(function() {
 <?php exit(0); ?>
 --EXPECT--
 OK: Got MongoDB\Driver\Exception\InvalidArgumentException
-Failed to parse MongoDB URI: 'invalid'. Invalid URI Schema, expecting 'mongodb://' or 'mongodb+srv://'.
+Failed to parse MongoDB URI: 'invalid'. Invalid URI, no scheme part specified.
 ===DONE===

tests/manager/manager-ctor_error-002.phpt

@@ -14,5 +14,5 @@ echo throws(function() {
 <?php exit(0); ?>
 --EXPECT--
 OK: Got MongoDB\Driver\Exception\InvalidArgumentException
-Failed to parse MongoDB URI: 'not a valid connection string'. Invalid URI Schema, expecting 'mongodb://' or 'mongodb+srv://'.
+Failed to parse MongoDB URI: 'not a valid connection string'. Invalid URI, no scheme part specified.
 ===DONE===

tests/manager/manager-ctor_error-004.phpt

@@ -19,7 +19,7 @@ echo throws(function () {
 <?php exit(0); ?>
 --EXPECT--
 OK: Got MongoDB\Driver\Exception\InvalidArgumentException
-Failed to parse MongoDB URI: 'mongodb://localhost:27017/?replicaSet='. Value for URI option "replicaset" cannot be empty string.
+Failed to parse MongoDB URI: 'mongodb://localhost:27017/?replicaSet='. Value for URI option "replicaSet" cannot be empty string.
 OK: Got MongoDB\Driver\Exception\InvalidArgumentException
 Value for URI option "replicaSet" cannot be empty string.
 ===DONE===