chore: rely on flint renovate preset

Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>

Author: zeitlinger

.github/renovate.json5

@@ -67,17 +67,6 @@
     },
   ],
   customManagers: [
-    {
-      // keep SHA-pinned raw.githubusercontent.com URLs in mise.toml up to date
-      customType: 'regex',
-      datasourceTemplate: 'github-tags',
-      managerFilePatterns: [
-        '/^mise\\.toml$/',
-      ],
-      matchStrings: [
-        'https://raw\\.githubusercontent\\.com/(?<depName>[^/]+/[^/]+)/(?<currentDigest>[a-f0-9]{40})/.*#\\s*(?<currentValue>v\\S+)',
-      ],
-    },
     {
       customType: 'regex',
       datasourceTemplate: 'docker',