PHPLIB-585: Update retryable writes spec tests

Synced with mongodb/specifications@439049d

Bumps ext-mongodb dependency for PHPC-1683

Author: jmikola

.travis.yml

@@ -22,7 +22,7 @@ cache:
 
 env:
   global:
-    - DRIVER_VERSION=1.8.0
+    - DRIVER_VERSION=1.8.1
     - SERVER_DISTRO=enterprise-ubuntu1604
     - SERVER_VERSION=4.4.0
     - DEPLOYMENT=STANDALONE

composer.json

@@ -12,7 +12,7 @@
         "php": "^7.0",
         "ext-hash": "*",
         "ext-json": "*",
-        "ext-mongodb": "^1.8",
+        "ext-mongodb": "^1.8.1",
         "jean85/pretty-package-versions": "^1.2"
     },
     "require-dev": {

tests/SpecTests/retryable-writes/insertOne-serverErrors.json

@@ -966,7 +966,10 @@
           ],
           "writeConcernError": {
             "code": 91,
-            "errmsg": "Replication is being shut down"
+            "errmsg": "Replication is being shut down",
+            "errorLabels": [
+              "RetryableWriteError"
+            ]
           }
         }
       },