chore: remove ecdsa in favor of coincurve (#3746)

uv.lock

@@ -1256,7 +1256,6 @@ dependencies = [
     { name = "bech32" },
     { name = "bolt11" },
     { name = "click" },
-    { name = "ecdsa" },
     { name = "embit" },
     { name = "fastapi" },
     { name = "fastapi-sso" },
@@ -1340,7 +1339,6 @@ requires-dist = [
     { name = "breez-sdk", marker = "extra == 'breez'", specifier = "==0.8.0" },
     { name = "breez-sdk-liquid", marker = "extra == 'breez'", specifier = "==0.11.11" },
     { name = "click", specifier = "==8.3.1" },
-    { name = "ecdsa", specifier = "==0.19.1" },
     { name = "embit", specifier = "==0.8.0" },
     { name = "fastapi", specifier = "==0.116.1" },
     { name = "fastapi-sso", specifier = "==0.19.0" },