Update phpstan/phpstan-nette requirement from 0.12.14 to 0.12.15

Updates the requirements on [phpstan/phpstan-nette](https://github.com/phpstan/phpstan-nette) to permit the latest version.
- [Release notes](https://github.com/phpstan/phpstan-nette/releases)
- [Commits](phpstan/phpstan-nette@0.12.14...0.12.15)

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

composer.json

@@ -26,7 +26,7 @@
         "phpstan/phpstan": "0.12.80",
         "phpstan/phpstan-strict-rules": "0.12.9",
         "pepakriz/phpstan-exception-rules": "0.11.6",
-        "phpstan/phpstan-nette": "0.12.14",
+        "phpstan/phpstan-nette": "0.12.15",
         "nepada/phpstan-nette-tester": "0.3.1",
         "spaze/phpstan-disallowed-calls": "1.3.0",
         "phpstan/phpstan-mockery": "0.12.12",