Merge branch '6.4' into 7.1

* 6.4:
  fix tests
  [DependencyInjection] Add tests for repeating `#[Autoconfigure]` attributes
  [DependencyInjection] Fix handling of repeated `#[Autoconfigure]` attributes
  [SecurityBundle] Make security schema deterministic
  [Translations][Core] Fix security Italian translation.
  clean up PHP version checks
  Support the `unique_proxy_open` event

Author: xabbuh

Resources/translations/security.it.xlf

@@ -76,7 +76,7 @@
             </trans-unit>
             <trans-unit id="20">
                 <source>Too many failed login attempts, please try again in %minutes% minutes.</source>
-                <target state="needs-review-translation">Troppi tentativi di accesso falliti, riprova tra %minutes% minuti.</target>
+                <target>Troppi tentativi di login falliti, riprova tra %minutes% minuti.</target>
             </trans-unit>
         </body>
     </file>