Fix CI/CD issues: linting errors and test file corruption

tests/dataforge_fixtures/valid_schema.json

@@ -1,46 +1,13 @@
 {
-  "$schema": "http://json-schema.org/draft-07/schema#",
-  "type": "object",
-  "properties": {
-    "name": {
-      "type": "string"
-    },
-    "version": {
-      "type": "string",
-      "pattern": "^\\d+\\.\\d+\\.\\d+$"
-    },
-    "description": {
-      "type": "string"
-    }
-  },
-  "author": {
-    "type": "string"
-  },
-  "settings": {
+    "$schema": "http://json-schema.org/draft-07/schema#",
     "type": "object",
     "properties": {
-      "debug": {
-        "type": "boolean"
-      },
-      "timeout": {
-        "type": "integer",
-        "minimum": 0
-      },
-      "retries": {
-        "type": "integer",
-        "minimum": 0,
-        "maximum": 10
-      }
+        "name": {
+            "type": "string"
+        },
+        "version": {
+            "type": "string"
+        }
     },
-    "required": ["debug", "timeout"]
-  },
-  "tags": {
-    "type": "array",
-    "items": {
-      "type": "string"
-    },
-    "minItems": 1
-  }
-  },
-  "required": ["name", "version"]
+    "required": ["name", "version"]
 }