ci: Fix CodeCov reports from failing spontaneously (#1536)

Author: ok-nick

codecov.yml

@@ -1,8 +1,12 @@
+codecov:
+  notify:
+    # Update this depending on how many independent jobs upload coverage results.
+    # https://docs.codecov.com/docs/notifications#section-preventing-notifications-until-after-n-builds
+    after_n_builds: 3
+
 coverage:
   status:
     project:
       default:
         target: auto
-        threshold: .1
-  notify:
-    after_n_builds: 5
+        threshold: 1%