Configure renovate to pin dependencies

.gitlab/renovate.json

@@ -2,7 +2,7 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "prConcurrentLimit": 1,
   "ignoreDeps": ["$CI_REGISTRY/funkwhale/backend-test-docker"],
-  "rangeStrategy": "bump",
+  "rangeStrategy": "pin",
   "lockFileMaintenance": { "enabled": true },
   "dependencyDashboard": true,
   "baseBranches": ["stable", "develop"],