Failed to look up helm package helm

[zhizhi10]

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When I set up customManagers to update my helm version, I get the error Failed to look up helm package helm
Below is my json Settings

    "customManagers": [
     {
      "customType": "regex",
      "fileMatch": ["Makefile.variables"],
      "matchStrings": ["kubernetes_version\\s*=\\s*(?<currentValue>\\S+)"],
      "depNameTemplate": "kubernetes",
      "versioningTemplate": "semver-coerced",
      "datasourceTemplate": "custom.kubernetes"
     },
     {
      "customType": "regex",
      "fileMatch": ["Makefile.variables"],
      "matchStrings": ["helm_version\\s*=\\s*(?<currentValue>\\S+)"],
      "depNameTemplate": "helm",
      "versioningTemplate": "semver",
      "datasourceTemplate": "helm"
     }
     ]

Below is get error

       "deps": [
              {
                "depName": "kubernetes",
                "currentValue": "1.31.2",
                "datasource": "custom.kubernetes",
                "versioning": "semver-coerced",
                "replaceString": "kubernetes_version = 1.31.2",
                "updates": [],
                "packageName": "kubernetes",
                "warnings": [],
                "currentVersion": "1.31.2",
                "fixedVersion": "1.31.2"
              }
            ],
            "matchStrings": ["kubernetes_version\\s*=\\s*(?<currentValue>\\S+)"],
            "depNameTemplate": "kubernetes",
            "datasourceTemplate": "custom.kubernetes",
            "versioningTemplate": "semver",
            "packageFile": "Makefile.variables"
          },
          {
            "deps": [
              {
                "depName": "helm",
                "currentValue": "2.16.2",
                "datasource": "helm",
                "versioning": "semver",
                "replaceString": "helm_version = 2.16.2",
                "updates": [],
                "packageName": "helm",
                "warnings": [
                  {"topic": "helm", "message": "Failed to look up helm package helm"}
                ]
              }
            ],
            "matchStrings": ["helm_version\\s*=\\s*(?<currentValue>\\S+)"],
            "depNameTemplate": "helm",
            "datasourceTemplate": "helm",
            "versioningTemplate": "semver",
            "packageFile": "Makefile.variables"
          },

Logs (if relevant)

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