Update confidential HTTP types with multi_headers and encrypt_output (#1824)

* Update confidential HTTP types with multi_headers and encrypt_output

Bump chainlink-protos/cre/go to cre-sdk/v1alpha.18 and regenerate.

Changes from chainlink-protos PR #289:
- Add encrypt_output field to ConfidentialHTTPRequest
- Add HeaderValues message for multi-value header support
- Replace headers with multi_headers (map[string]*HeaderValues) in HTTPRequest
- Replace headers with multi_headers (map[string]*HeaderValues) in HTTPResponse

* Run gomodtidy

Author: nadahalli

go.mod

@@ -41,7 +41,7 @@ require (
 	github.com/smartcontractkit/chain-selectors v1.0.89
 	github.com/smartcontractkit/chainlink-common/pkg/chipingress v0.0.10
 	github.com/smartcontractkit/chainlink-protos/billing/go v0.0.0-20251024234028-0988426d98f4
-	github.com/smartcontractkit/chainlink-protos/cre/go v0.0.0-20260204211151-e87a8bf189b0
+	github.com/smartcontractkit/chainlink-protos/cre/go v0.0.0-20260206000552-087e235a7963
 	github.com/smartcontractkit/chainlink-protos/linking-service/go v0.0.0-20251002192024-d2ad9222409b
 	github.com/smartcontractkit/chainlink-protos/storage-service v0.3.0
 	github.com/smartcontractkit/chainlink-protos/workflows/go v0.0.0-20260106052706-6dd937cb5ec6

go.sum

@@ -332,8 +332,8 @@ github.com/smartcontractkit/chainlink-common/pkg/chipingress v0.0.10 h1:FJAFgXS9
 github.com/smartcontractkit/chainlink-common/pkg/chipingress v0.0.10/go.mod h1:oiDa54M0FwxevWwyAX773lwdWvFYYlYHHQV1LQ5HpWY=
 github.com/smartcontractkit/chainlink-protos/billing/go v0.0.0-20251024234028-0988426d98f4 h1:GCzrxDWn3b7jFfEA+WiYRi8CKoegsayiDoJBCjYkneE=
 github.com/smartcontractkit/chainlink-protos/billing/go v0.0.0-20251024234028-0988426d98f4/go.mod h1:HHGeDUpAsPa0pmOx7wrByCitjQ0mbUxf0R9v+g67uCA=
-github.com/smartcontractkit/chainlink-protos/cre/go v0.0.0-20260204211151-e87a8bf189b0 h1:+/0xWigvOxFLghyivyxiUCYGcky/7i8IxfGTdTeaXFg=
-github.com/smartcontractkit/chainlink-protos/cre/go v0.0.0-20260204211151-e87a8bf189b0/go.mod h1:Jqt53s27Tr0jDl8mdBXg1xhu6F8Fci8JOuq43tgHOM8=
+github.com/smartcontractkit/chainlink-protos/cre/go v0.0.0-20260206000552-087e235a7963 h1:DCLvEn4KkFzYbK/AYl4vJmf6EHaskPYvGDGdd0kOma0=
+github.com/smartcontractkit/chainlink-protos/cre/go v0.0.0-20260206000552-087e235a7963/go.mod h1:Jqt53s27Tr0jDl8mdBXg1xhu6F8Fci8JOuq43tgHOM8=
 github.com/smartcontractkit/chainlink-protos/linking-service/go v0.0.0-20251002192024-d2ad9222409b h1:QuI6SmQFK/zyUlVWEf0GMkiUYBPY4lssn26nKSd/bOM=
 github.com/smartcontractkit/chainlink-protos/linking-service/go v0.0.0-20251002192024-d2ad9222409b/go.mod h1:qSTSwX3cBP3FKQwQacdjArqv0g6QnukjV4XuzO6UyoY=
 github.com/smartcontractkit/chainlink-protos/storage-service v0.3.0 h1:B7itmjy+CMJ26elVw/cAJqqhBQ3Xa/mBYWK0/rQ5MuI=