deps: turn off renovate for numpy in tests feature

Author: lucascolley

renovate.json

@@ -25,6 +25,12 @@
     "groupName": "gha",
     "schedule": ["* * 15 * *"],
     "automerge": true
+  }, {
+    "description": "Don't bump test dependencies for oldest Python compatibility.",
+    "matchManagers": ["pixi"],
+    "matchDepTypes": ["feature-tests"],
+    "matchPackageNames": ["numpy"],
+    "enabled": false
   }, {
     "description": "Block PRs for updates blocked on dropping Python 3.10.",
     "matchManagers": ["pixi"],