Update doctrine/dbal requirement from ^2.4 to ^3.1

Updates the requirements on [doctrine/dbal](https://github.com/doctrine/dbal) to permit the latest version.
- [Release notes](https://github.com/doctrine/dbal/releases)
- [Commits](doctrine/dbal@v2.4.0...3.1.0)

---
updated-dependencies:
- dependency-name: doctrine/dbal
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

composer.json

@@ -5,7 +5,7 @@
     "require": {
         "php": ">=7.2",
         "broadway/broadway": "^2.3.1",
-        "doctrine/dbal": "^2.4"
+        "doctrine/dbal": "^3.1"
     },
     "authors": [
       {