minor #28044 [DoctrineBridge] allow dev versions of Doctrine again (nicolas-grekas)

This PR was merged into the 3.4 branch.

Discussion
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[DoctrineBridge] allow dev versions of Doctrine again

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

I don't expect this to be green yet, but let's see progress on Doctrine side.
Submitted against 4.0 for now, but should be merged on 3.4 when green.

Commits
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83dcbe9096 [DoctrineBridge] allow dev versions of Doctrine again

composer.json

@@ -18,7 +18,7 @@
     "require": {
         "php": "^5.5.9|>=7.0.8",
         "ext-xml": "*",
-        "doctrine/common": "~2.4@stable",
+        "doctrine/common": "~2.4",
         "fig/link-util": "^1.0",
         "twig/twig": "^1.35|^2.4.4",
         "psr/cache": "~1.0",
@@ -92,7 +92,7 @@
         "doctrine/cache": "~1.6",
         "doctrine/data-fixtures": "1.0.*",
         "doctrine/dbal": "~2.4",
-        "doctrine/orm": "~2.4,>=2.4.5,<=2.7.0",
+        "doctrine/orm": "~2.4,>=2.4.5",
         "doctrine/doctrine-bundle": "~1.4",
         "monolog/monolog": "~1.11",
         "ocramius/proxy-manager": "~0.4|~1.0|~2.0",

src/Symfony/Bridge/Doctrine/composer.json

@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": "^5.5.9|>=7.0.8",
-        "doctrine/common": "~2.4@stable",
+        "doctrine/common": "~2.4",
         "symfony/polyfill-ctype": "~1.8",
         "symfony/polyfill-mbstring": "~1.0"
     },