chore(renovate): skip major updates of indirect Go modules

A new major version of a Go module is a separate module path. For an
indirect dependency nothing imports it, so Renovate only adds an unused
requirement, as in #24 (go.yaml.in/yaml/v3 to v4). Minor and patch
updates of indirect modules stay enabled.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

renovate.json

@@ -25,6 +25,19 @@
       ],
       "enabled": true
     },
+    {
+      "description": "Skip major updates of indirect Go modules: a new major version is a separate module path that no dependency imports, so the update only adds an unused requirement",
+      "matchManagers": [
+        "gomod"
+      ],
+      "matchDepTypes": [
+        "indirect"
+      ],
+      "matchUpdateTypes": [
+        "major"
+      ],
+      "enabled": false
+    },
     {
       "description": "Update the Go version declared in go.mod",
       "matchManagers": [