build(deps-dev): update phpstan/phpstan-nette requirement (#504)

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...0.12.16)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

composer.json

@@ -38,7 +38,7 @@
 		"phpstan/extension-installer": "1.1.0",
 		"phpstan/phpstan": "0.12.81",
 		"phpstan/phpstan-deprecation-rules": "0.12.6",
-		"phpstan/phpstan-nette": "0.12.14",
+		"phpstan/phpstan-nette": "0.12.16",
 		"phpstan/phpstan-mockery": "0.12.12",
 		"phpstan/phpstan-strict-rules": "0.12.9",
 		"nextras/orm-phpstan": "dev-master",