Failed to look up helm package helm

[zhizhi10]

Describe the proposed change(s).

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"
           },

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