fix: add go-redis/v9 dependency to consent-service

The session_store imports github.com/redis/go-redis/v9 but it was
missing from go.mod, causing build failures in CI.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

consent-service/go.mod

@@ -8,6 +8,7 @@ require (
 	github.com/google/uuid v1.6.0
 	github.com/jackc/pgx/v5 v5.7.6
 	github.com/joho/godotenv v1.5.1
+	github.com/redis/go-redis/v9 v9.17.3
 	github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e
 	golang.org/x/crypto v0.40.0
 )
@@ -15,7 +16,9 @@ require (
 require (
 	github.com/bytedance/sonic v1.14.0 // indirect
 	github.com/bytedance/sonic/loader v0.3.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/cloudwego/base64x v0.1.6 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 	github.com/gabriel-vasile/mimetype v1.4.8 // indirect
 	github.com/gin-contrib/sse v1.1.0 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect