minor #54380 [DependencyInjection] fix test (xabbuh)

This PR was merged into the 7.1 branch.

Discussion
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[DependencyInjection]  fix test

| Q             | A
| ------------- | ---
| Branch?       | 7.1
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

Commits
-------

df97b92 fix test

src/Symfony/Component/DependencyInjection/Tests/ParameterBag/EnvPlaceholderParameterBagTest.php

@@ -31,7 +31,7 @@ public function testGetThrowsInvalidArgumentExceptionIfEnvNameContainsNonWordCha
     {
         $bag = new EnvPlaceholderParameterBag();
         $this->expectException(InvalidArgumentException::class);
-        $this->expectExceptionMessage('Invalid env(%foo%) name: only "word" characters are allowed.');
+        $this->expectExceptionMessage('The given env var name "env(%foo%)" contains invalid characters (allowed characters: letters, digits, hyphens, backslashes and colons).');
         $bag->get('env(%foo%)');
     }