Merge pull request #706 from naymspace/feature/update-renovate-mix-up…

…date-lockfile

Set renovate `rangeStrategy` to `update-lockfile` for mix deps

.github/renovate.json

@@ -11,6 +11,12 @@
     ":reviewer(krns)"
   ],
   "packageRules": [
+    {
+      "matchManagers": [
+        "mix"
+      ],
+      "rangeStrategy": "update-lockfile"
+    },
     {
       "description": "Group updates to the Elixir base image",
       "groupName": "Base Image",
@@ -74,4 +80,4 @@
     "dependencies",
     "{{categories}}"
   ]
-}
+}