fix: spark connect client spark version (#1206)

Author: razvan

spark-connect-client/versions.py

@@ -1,7 +1,7 @@
 versions = [
     {
         "product": "3.5.6",
-        "spark-k8s": "3.5.5",
+        "spark-k8s": "3.5.6",
         "java-base": "17",
         "python": "3.11",
     },