Ignore golang.org/x/sys changes

The golang sys package has no versions, since it is autogenerated from system headers which might change in various places with no control of the golang team.

We know we use only somwhat stable APIs, and even if not, we would have to debug this manually. So updating these packages does not really make sense.

Author: dragetd

.github/renovate.json

@@ -1,5 +1,5 @@
 {
   "extends": ["config:base"],
   "rebaseWhen": "behind-base-branch",
-  "ignoreDeps": ["golang.org/x/net", "golang.org/x/system"]
+  "ignoreDeps": ["golang.org/x/net", "golang.org/x/sys"]
 }