Remove pytest constraint

Author: ladinesa

pyproject.toml

@@ -20,10 +20,10 @@ homepage = "https://github.com/nomad-coe/nomad-normalizer-plugin-system"
 dev = [
     "ase>=3.22.0",
     'mypy>=1.15',
-    'pytest>= 5.3.0, <8',
-    'pytest-timeout>=1.4.2',
-    'pytest-cov>=2.7.1',
-    'ruff>=0.6',
+    'pytest',
+    'pytest-timeout',
+    'pytest-cov',
+    'ruff',
     'typing-extensions>=4.12',
 ]