Address Renovate warning about the repositories configuration option (#907)

* Update update-dependencies to select the repo

* Update renovate.json to remove the repo selection

Author: mauroservienti

.github/renovate.json

@@ -2,7 +2,6 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": ["config:recommended"],
   "branchPrefix": "renovate/",
-  "repositories": ["ServiceComposer/ServiceComposer.AspNetCore"],
   "packageRules": [{
      "matchPackageNames": ["Microsoft.CodeAnalysis.CSharp"],
      "matchUpdateTypes": ["minor", "major"],

.github/workflows/update-dependencies.yml

@@ -14,3 +14,5 @@ jobs:
         with:
           token: ${{ secrets.RENOVATE_TOKEN }}
           configurationFile: .github/renovate.json
+        env:
+          RENOVATE_REPOSITORIES: ${{ github.repository }}