CI: Make codecov less demanding

Change-Id: I80b4497b611ad5f0e4f3e595c5ee4e938a06daca
diff --git a/.Rbuildignore b/.Rbuildignore
index f6ac482..94b7df9 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -14,3 +14,4 @@
 ^.gitlab-ci
 ^CLAUDE.md
 ^.claude
+^codecov\.yml$