Locked dbal to 2.9.2

Because the 2.9.3 seems to break test.
Like a conflict with `DoctrineTestBundle` I guess (which can't be updated because we are still allowing PHP 7.1 and is not).

The generated error usually appear when we update data using a service during test (like changing the craue config).
Here is the error:

```
Testing tests/Wallabag/CoreBundle/Controller/
PHP Fatal error:  Uncaught PDOException: There is no active transaction in /Users/jeremy/Sites/github/wallabag/vendor/dama/doctrine-test-bundle/src/DAMA/DoctrineTestBundle/Doctrine/DBAL/StaticDriver.php:142
Stack trace:
#0 /Users/jeremy/Sites/github/wallabag/vendor/dama/doctrine-test-bundle/src/DAMA/DoctrineTestBundle/Doctrine/DBAL/StaticDriver.php(142): PDO->rollBack()
#1 /Users/jeremy/Sites/github/wallabag/vendor/dama/doctrine-test-bundle/src/DAMA/DoctrineTestBundle/PHPUnit/PHPUnitListener.php(39): DAMA\DoctrineTestBundle\Doctrine\DBAL\StaticDriver::rollBack()
#2 /Users/jeremy/Sites/github/wallabag/vendor/bin/.phpunit/phpunit-7.4/src/Framework/TestResult.php(412): DAMA\DoctrineTestBundle\PHPUnit\PHPUnitListener->endTest(Object(Tests\Wallabag\CoreBundle\Controller\ConfigControllerTest), 3.3917479515076)
#3 /Users/jeremy/Sites/github/wallabag/vendor/bin/.phpunit/phpunit-7.4/src/Framework/TestResult.php(893): PHPUnit\Framework\TestResult->endTest(Object(Tests\Wallabag\CoreBundle\Controller\ConfigControllerTest), 3.3917479515076 in /Users/jeremy/Sites/github/wallabag/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php on line 91

Fatal error: Uncaught PDOException: There is no active transaction in /Users/jeremy/Sites/github/wallabag/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php on line 91

InvalidArgumentException: The controller for URI "/config" is not callable. The "kernel" service is synthetic, it needs to be set at boot time before it can be used. in /Users/jeremy/Sites/github/wallabag/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php on line 91

Call Stack:
    3.4732   57305872   1. Symfony\Component\Debug\ErrorHandler->handleException() /Users/jeremy/Sites/github/wallabag/vendor/symfony/symfony/src/Symfony/Component/Debug/ErrorHandler.php:0
    3.5000   58014320   2. Symfony\Component\Debug\ErrorHandler->handleException() /Users/jeremy/Sites/github/wallabag/vendor/symfony/symfony/src/Symfony/Component/Debug/ErrorHandler.php:613
```

1 files changed, 10 insertions, 10 deletions

diff --git a/composer.lock b/composer.lock
index 8a005d48..d4ca6d2f 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "02ec26b02dc55d65cb9353ad99be7ebe",
+    "content-hash": "bc03955d5e8ea3079c82f32de2e26c98",
     "packages": [
         {
             "name": "bdunogier/guzzle-site-authenticator",
@@ -648,16 +648,16 @@
         },
         {
             "name": "doctrine/dbal",
-            "version": "v2.9.3",
+            "version": "v2.9.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/dbal.git",
-                "reference": "7345cd59edfa2036eb0fa4264b77ae2576842035"
+                "reference": "22800bd651c1d8d2a9719e2a3dc46d5108ebfcc9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/dbal/zipball/7345cd59edfa2036eb0fa4264b77ae2576842035",
-                "reference": "7345cd59edfa2036eb0fa4264b77ae2576842035",
+                "url": "https://api.github.com/repos/doctrine/dbal/zipball/22800bd651c1d8d2a9719e2a3dc46d5108ebfcc9",
+                "reference": "22800bd651c1d8d2a9719e2a3dc46d5108ebfcc9",
                 "shasum": ""
             },
             "require": {
@@ -698,10 +698,6 @@
             ],
             "authors": [
                 {
-                    "name": "Guilherme Blanco",
-                    "email": "guilhermeblanco@gmail.com"
-                },
-                {
                     "name": "Roman Borschel",
                     "email": "roman@code-factory.org"
                 },
@@ -710,6 +706,10 @@
                     "email": "kontakt@beberlei.de"
                 },
                 {
+                    "name": "Guilherme Blanco",
+                    "email": "guilhermeblanco@gmail.com"
+                },
+                {
                     "name": "Jonathan Wage",
                     "email": "jonwage@gmail.com"
                 }
@@ -726,7 +726,7 @@
                 "php",
                 "queryobject"
             ],
-            "time": "2019-11-02T22:19:34+00:00"
+            "time": "2018-12-31T03:27:51+00:00"
         },
         {
             "name": "doctrine/doctrine-bundle",