Fix Renovate config migration warning

[TWiStErRob]

Description

• Fix migration warnings in Renovate CI.
• npm warning is not fixable here, raised Tell npm to auto-install dependency suzuki-shunsuke/github-action-renovate-config-validator#551

Note: this can be prevented with the strict option, but it depends on external factors: a release of renovate can break master. Note the v1 version of this action (pending in dependency dashboard is enabling strict by default).

Motivation and Context

===> RENOVATE_CONFIG_FILE="renovate.json" npx --package "renovate" -c renovate-config-validator
npm WARN exec The following package was not found and will be installed: [email protected]
 INFO: Validating renovate.json
 WARN: Config migration necessary
       "oldConfig": {
         "$schema": "https://docs.renovatebot.com/renovate-schema.json",
         "extends": ["config:base"],
         "semanticCommits": "disabled",
         "packageRules": [
           {
             "matchUpdateTypes": ["minor", "patch", "pin", "digest"],
             "automerge": true,
             "automergeType": "branch"
           }
         ]
       },
       "newConfig": {
         "$schema": "https://docs.renovatebot.com/renovate-schema.json",
         "extends": ["config:recommended"],
         "semanticCommits": "disabled",
         "packageRules": [
           {
             "matchUpdateTypes": ["minor", "patch", "pin", "digest"],
             "automerge": true,
             "automergeType": "branch"
           }
         ]
       }
 WARN: Config needs migrating
       "originalConfig": {
         "$schema": "https://docs.renovatebot.com/renovate-schema.json",
         "extends": ["config:base"],
         "semanticCommits": "disabled",
         "packageRules": [
           {
             "matchUpdateTypes": ["minor", "patch", "pin", "digest"],
             "automerge": true,
             "automergeType": "branch"
           }
         ]
       },
       "migratedConfig": {
         "$schema": "https://docs.renovatebot.com/renovate-schema.json",
         "extends": ["config:recommended"],
         "semanticCommits": "disabled",
         "packageRules": [
           {
             "matchUpdateTypes": ["minor", "patch", "pin", "digest"],
             "automerge": true,
             "automergeType": "branch"
           }
         ]
       }
 INFO: Validating renovate.json
 INFO: Config validated successfully

[sjudd]

Thanks! sorry for the delay