minor symfony#53882 [ExpressionLanguage][Validator] document deprecation and fix test (xabbuh)

This PR was merged into the 7.1 branch.

Discussion
----------

[ExpressionLanguage][Validator]  document deprecation and fix test

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

Commits
-------

e248c61 document deprecation and fix test

Author: nicolas-grekas

UPGRADE-7.1.md

@@ -6,6 +6,12 @@ Cache
 
  * Deprecate `CouchbaseBucketAdapter`, use `CouchbaseCollectionAdapter` instead
 
+ExpressionLanguage
+------------------
+
+ * Deprecate passing `null` as the allowed variable names to `ExpressionLanguage::lint()` and `Parser::lint()`,
+   pass the `IGNORE_UNKNOWN_VARIABLES` flag instead to ignore unknown variables during linting
+
 FrameworkBundle
 ---------------
 

src/Symfony/Component/ExpressionLanguage/CHANGELOG.md

@@ -7,6 +7,8 @@ CHANGELOG
  * Add support for PHP `min` and `max` functions
  * Add `Parser::IGNORE_UNKNOWN_VARIABLES` and `Parser::IGNORE_UNKNOWN_FUNCTIONS` flags to control whether
    parsing and linting should check for unknown variables and functions.
+ * Deprecate passing `null` as the allowed variable names to `ExpressionLanguage::lint()` and `Parser::lint()`,
+   pass the `IGNORE_UNKNOWN_VARIABLES` flag instead to ignore unknown variables during linting
 
 7.0
 ---

src/Symfony/Component/Validator/Tests/Constraints/ExpressionSyntaxValidatorTest.php

@@ -62,7 +62,7 @@ public function testExpressionWithoutNames()
     {
         $this->validator->validate('1 + 1', new ExpressionSyntax([
             'message' => 'myMessage',
-        ]));
+        ], null, null, []));
 
         $this->assertNoViolation();
     }