Update bitnami/kubectl Docker tag to v1.28.2

This MR contains the following updates:

Package	Update	Change
bitnami/kubectl	minor	1.27.6 -> 1.28.2

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docker-compose.yml

@@ -57,7 +57,7 @@ services:
       - kube_port_mysql
     entrypoint: ["bash", "-c", "flask run --host $$(hostname -i)"]
   kube_port_kratos_admin:
-    image: bitnami/kubectl:1.27.6
+    image: bitnami/kubectl:1.28.2
     user: "${KUBECTL_UID}:${KUBECTL_GID}"
     expose:
       - 8000
@@ -70,7 +70,7 @@ services:
         "kubectl -n stackspin port-forward --address $$(hostname -i) service/kratos-admin 8000:80",
       ]
   kube_port_hydra_admin:
-    image: bitnami/kubectl:1.27.6
+    image: bitnami/kubectl:1.28.2
     user: "${KUBECTL_UID}:${KUBECTL_GID}"
     expose:
       - 4445
@@ -83,7 +83,7 @@ services:
         "kubectl -n stackspin port-forward --address $$(hostname -i) service/hydra-admin 4445:4445",
       ]
   kube_port_kratos_public:
-    image: bitnami/kubectl:1.27.6
+    image: bitnami/kubectl:1.28.2
     user: "${KUBECTL_UID}:${KUBECTL_GID}"
     ports:
       - "8080:8080"
@@ -98,7 +98,7 @@ services:
         "kubectl -n stackspin port-forward --address 0.0.0.0 service/kratos-public 8080:80",
       ]
   kube_port_mysql:
-    image: bitnami/kubectl:1.27.6
+    image: bitnami/kubectl:1.28.2
     user: "${KUBECTL_UID}:${KUBECTL_GID}"
     expose:
       - 3306