Merge branch '3.4' into 4.3

* 3.4:
  CS
  [Serializer] Skip uninitialized (PHP 7.4) properties in PropertyNormalizer and ObjectNormalizer
  stop using deprecated Doctrine persistence classes
  Fix regex lookahead syntax in ApplicationTest
  [SecurityBundle][FirewallMap] Remove unused property
  [DI] Improve performance of processDefinition
  Fix invalid Windows path normalization
  [Validator][ConstraintValidator] Safe fail on invalid timezones
  [DoctrineBridge] Fixed submitting invalid ids when using queries with limit
  fix comparisons with null values at property paths

Author: nicolas-grekas

Templating/TemplateNameParser.php

@@ -48,7 +48,7 @@ public function parse($name)
         }
 
         // normalize name
-        $name = str_replace(':/', ':', preg_replace('#/{2,}#', '/', str_replace('\\', '/', $name)));
+        $name = preg_replace('#/{2,}#', '/', str_replace('\\', '/', $name));
 
         if (false !== strpos($name, '..')) {
             throw new \RuntimeException(sprintf('Template name "%s" contains invalid characters.', $name));