Update renovate.json5

.github/renovate.json5

@@ -35,7 +35,7 @@
       // the name of the dependency in the package manager
       depNameTemplate: "grpc/grpc",
       // which package manager should Renovate Bot look to find this dependency?
-      datasourceTemplate: "github-releases",
+      datasourceTemplate: "github-tags",
       // since we only keep the version up to minor and we do not use the v prefix, we need to extract major.minor from the fetched new version
       extractVersionTemplate: "^v(?<version>\\d+\\.\\d+)\\.\\d+",
       // by default versioningTemplate is semvar, but since we have the v prefix, we need to use a regex to specify the type of the version.