composer(deps-dev): bump phpstan/phpstan-deprecation-rules

Bumps [phpstan/phpstan-deprecation-rules](https://github.com/phpstan/phpstan-deprecation-rules) from 0.12.5 to 0.12.6.
- [Release notes](https://github.com/phpstan/phpstan-deprecation-rules/releases)
- [Commits](phpstan/phpstan-deprecation-rules@0.12.5...0.12.6)

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

Author: dependabot[bot]

composer.json

@@ -24,7 +24,7 @@
     "jangregor/phpstan-prophecy": "~0.8.1",
     "phpstan/extension-installer": "^1.1.0",
     "phpstan/phpstan": "~0.12.59",
-    "phpstan/phpstan-deprecation-rules": "~0.12.5",
+    "phpstan/phpstan-deprecation-rules": "~0.12.6",
     "phpstan/phpstan-phpunit": "~0.12.16",
     "phpstan/phpstan-strict-rules": "~0.12.5",
     "phpunit/phpunit": "^8.5.13",