fix: allowlist stablecoin contract false positives

Author: Henry

.gitleaksignore

@@ -10,3 +10,6 @@
 21c3ca2c0c427ed2a40619a6fea40f3c7fec6735:frontend/dist/js/app-legacy.d6d98b57.js:generic-api-key:1
 ffdd2ffbae99cd77f90c9c9facd6f290d033dd2b:backend_api_python/app/routes/settings.py:generic-api-key:610
 f43312a8587248c326fd4dda89e8140954178246:quantdinger_vue/src/mock/services/auth.js:generic-api-key:30
+b277e53750c68d560f439389f5f3d8cae0665635:backend_api_python/app/routes/settings.py:generic-api-key:1541
+b277e53750c68d560f439389f5f3d8cae0665635:backend_api_python/app/routes/settings.py:generic-api-key:1549
+b277e53750c68d560f439389f5f3d8cae0665635:backend_api_python/app/routes/settings.py:generic-api-key:1593