chore(deps-dev): bump phpstan/phpstan from 1.10.20 to 1.10.21

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 1.10.20 to 1.10.21.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/1.11.x/CHANGELOG.md)
- [Commits](https://github.com/phpstan/phpstan/compare/1.10.20...1.10.21)

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

composer.lock

@@ -9979,16 +9979,16 @@
         },
         {
             "name": "phpstan/phpstan",
-            "version": "1.10.20",
+            "version": "1.10.21",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan.git",
-                "reference": "c4c8adb56313fbd59ff5a5f4a496bbed1a6b8803"
+                "reference": "b2a30186be2e4d97dce754ae4e65eb0ec2f04eb5"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/c4c8adb56313fbd59ff5a5f4a496bbed1a6b8803",
-                "reference": "c4c8adb56313fbd59ff5a5f4a496bbed1a6b8803",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/b2a30186be2e4d97dce754ae4e65eb0ec2f04eb5",
+                "reference": "b2a30186be2e4d97dce754ae4e65eb0ec2f04eb5",
                 "shasum": ""
             },
             "require": {
@@ -10037,7 +10037,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-06-20T12:07:40+00:00"
+            "time": "2023-06-21T20:07:58+00:00"
         },
         {
             "name": "phpstan/phpstan-deprecation-rules",