build(dependencies): 后端依赖 - 升级 go-redis 至 9.22.0

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Original-PR: https://github.com/ddcat-ai/open-ai-canvas/pull/211

backend/go.mod

@@ -4,7 +4,7 @@ go 1.25.0
 
 require (
 	github.com/gin-gonic/gin v1.12.0
-	github.com/redis/go-redis/v9 v9.21.0
+	github.com/redis/go-redis/v9 v9.22.0
 	github.com/tencentyun/cos-go-sdk-v5 v0.7.75
 	github.com/volcengine/volc-sdk-golang v1.0.253
 	golang.org/x/crypto v0.54.0