Update spaze/phpstan-disallowed-calls requirement from 1.4.0 to 1.6.0

Updates the requirements on spaze/phpstan-disallowed-calls to permit the latest version.

---
updated-dependencies:
- dependency-name: spaze/phpstan-disallowed-calls
  dependency-type: direct:development
...

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

composer.json

@@ -27,7 +27,7 @@
         "pepakriz/phpstan-exception-rules": "0.11.7",
         "phpstan/phpstan-nette": "0.12.21",
         "nepada/phpstan-nette-tester": "0.3.1",
-        "spaze/phpstan-disallowed-calls": "1.4.0",
+        "spaze/phpstan-disallowed-calls": "1.6.0",
         "php-parallel-lint/php-parallel-lint": "1.3.0",
         "nepada/coding-standard": "7.4.0",
         "nette/bootstrap": "^3.0@dev",