maint:update test wf to redis 8.6.1

Author: cunla

.github/workflows/test.yml

@@ -28,7 +28,7 @@ jobs:
       fail-fast: false
       matrix:
         redis-image:
-          - "redis:8.4.0"
+          - "redis:8.6.1"
           - "valkey/valkey:9.0.0"
           - "redis:7.4.2"
           - "valkey/valkey:8.1.3"
@@ -41,7 +41,7 @@ jobs:
           - python-version: "3.9"
             redis-py: "7.2.1"
           - python-version: "3.13"
-            redis-image: "redis:8.4.0"
+            redis-image: "redis:8.6.1"
             redis-py: "7.2.1"
             install-extras: false
             coverage: false
@@ -55,7 +55,7 @@ jobs:
             redis-py: "7.2.1"
             install-extras: true
           - python-version: "3.13"
-            redis-image: "redis:8.4.0"
+            redis-image: "redis:8.6.1"
             redis-py: "7.2.1"
             install-extras: true
             coverage: true