fix: update test to use text input type instead of removed password variant

Signed-off-by: Mohammod Al Amin Ashik <maa.ashik00@gmail.com>

Author: its-mash

crates/mcpmux-core/src/registry/schema.rs

@@ -339,7 +339,7 @@ mod tests {
                 {
                     "id": "GITHUB_PERSONAL_ACCESS_TOKEN",
                     "label": "GitHub Personal Access Token",
-                    "type": "password",
+                    "type": "text",
                     "required": true,
                     "secret": true,
                     "obtain": {