fix: verify_ssl: true in YAML now uses DEFAULT_REDMINE_VERIFY path

Previously boolean True was passed directly to python-redmine
which used system CA bundle instead of the project's default CA file.
Now 'true' in YAML maps to DEFAULT_REDMINE_VERIFY path.

redmine_reporter/config.py

@@ -139,13 +139,13 @@ class AppConfig:
         if value is None:
             return DEFAULT_REDMINE_VERIFY
         if isinstance(value, bool):
-            return value
+            return DEFAULT_REDMINE_VERIFY if value else False
         if isinstance(value, str):
             normalized = value.lower()
             if normalized in FALSE_VALUES:
                 return False
             if normalized in TRUE_VALUES:
-                return True
+                return DEFAULT_REDMINE_VERIFY
             return resolve_env_vars(value)
         return DEFAULT_REDMINE_VERIFY