minor #1185 Allow using PHP 8 to run the project (javiereguiluz)

This PR was squashed before being merged into the main branch.

Discussion
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Allow using PHP 8 to run the project

This project is not compatible with PHP 8 at the moment because of `doctrine/dbal`.

The problem is that to upgrade DBAL we need to upgrade our PHP requirement too. We require PHP `^7.2.9` (to match Symfony's own requirements) but the DBAL version compatible with PHP 8 requires `^7.3|^8.0`.

So, I guess we can make an exception and require PHP 7.3 in this project to fix this issue. @nicolas-grekas do you agree with this solution or do you think we can solve this differently? Thanks!

Commits
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782b08d Allow using PHP 8 to run the project

Author: javiereguiluz

.github/workflows/ci.yaml

@@ -26,7 +26,7 @@ jobs:
         strategy:
             matrix:
                 operating-system: ['ubuntu-latest', 'windows-latest', 'macos-latest']
-                php-version: ['7.2.9', '7.3', '7.4', '8.0']
+                php-version: ['7.3', '7.4', '8.0']
 
         steps:
             - name: "Checkout code"

composer.json

@@ -10,12 +10,12 @@
         "symfony/polyfill-php72": "*"
     },
     "require": {
-        "php": "^7.2.9",
+        "php": "^7.3",
         "ext-pdo_sqlite": "*",
         "composer/package-versions-deprecated": "^1.8",
-        "doctrine/doctrine-bundle": "^1.12|^2.0",
+        "doctrine/doctrine-bundle": "^2.0",
         "doctrine/doctrine-migrations-bundle": "^3.0",
-        "doctrine/orm": "^2.5.11",
+        "doctrine/orm": "^2.5",
         "erusev/parsedown": "^1.6",
         "sensio/framework-extra-bundle": "^5.6",
         "symfony/apache-pack": "^1.0",
@@ -54,7 +54,7 @@
     },
     "config": {
         "platform": {
-            "php": "7.2.9"
+            "php": "7.3"
         },
         "preferred-install": {
             "*": "dist"