fix(datatables): send external cluster passwords as SCRAM verifiers

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

backend/Cargo.lock

@@ -15653,6 +15653,7 @@ dependencies = [
  "pin-project-lite",
  "pkcs1",
  "postgres-native-tls 0.5.3",
+ "postgres-protocol",
  "prometheus",
  "quick_cache",
  "rand 0.9.0",

backend/Cargo.toml

@@ -624,6 +624,7 @@ wasm-bindgen-test = "^0"
 convert_case = "0.6.0"
 getrandom = "0.2"
 tokio-postgres = {version = "^0.7", features = ["array-impls", "with-serde_json-1", "with-chrono-0_4", "with-uuid-1", "with-bit-vec-0_6"]}
+postgres-protocol = "0.6"
 rust-postgres = { package = "tokio-postgres", git = "https://github.com/MaterializeInc/rust-postgres", rev = "78c1222577bb091d69bc22b1bc7ad01c14675abe"}
 rust-postgres-native-tls = { package = "postgres-native-tls", git = "https://github.com/MaterializeInc/rust-postgres", features = ["runtime"], rev = "78c1222577bb091d69bc22b1bc7ad01c14675abe" }
 bit-vec = "=0.6.3"

backend/ee-repo-ref.txt

@@ -1 +1 @@
-6ced9da74422ae8feee10da70419ccedf313506c
+760219d356e0e396f8c8e94b04a86cdeaa34b06f

backend/windmill-common/Cargo.toml

@@ -75,6 +75,7 @@ bitflags.workspace = true
 once_cell.workspace = true
 phf.workspace = true
 tokio-postgres.workspace = true
+postgres-protocol.workspace = true
 postgres-native-tls.workspace = true
 native-tls.workspace = true