Make token and hf token password

app.py

@@ -88,10 +88,12 @@ with gr.Blocks(theme=theme) as iface:
             api_key_input = gr.Textbox(
                 label="Giskard Hub API Key",
                 value=os.environ.get("GSK_API_KEY"),
+                type="password",
                 placeholder="gsk-xxxxxxxxxxxxxxxxxxxxxxxxxxxx",
             )
             hf_token_input = gr.Textbox(
                 label="Hugging Face Spaces Token",
+                type="password",
                 info="if using a private Giskard Hub on Hugging Face Spaces",
             )