Add k8s EndpointSlice support to prometheus.json (SchemaStore#5076)

* Add k8s EndpointSlice support to prometheus.json

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: sugymt

src/schemas/json/prometheus.json

@@ -698,7 +698,14 @@
           "role": {
             "description": "The Kubernetes role of entities that should be discovered. One of endpoints, service, pod, node, or ingress.",
             "type": "string",
-            "enum": ["endpoints", "service", "pod", "node", "ingress"]
+            "enum": [
+              "endpointslice",
+              "endpoints",
+              "service",
+              "pod",
+              "node",
+              "ingress"
+            ]
           },
           "kubeconfig_file": {
             "$ref": "#/definitions/filepath"