Set codecov status thresholds to 5%

and rename file to be less dotty

.github/.codecov.yml

@@ -1,3 +0,0 @@
-comment: false
-coverage:
-  threshold: 5%

.github/codecov.yml

@@ -0,0 +1,9 @@
+comment: false
+coverage:
+  status:
+    project:
+      default:
+        threshold: 5%
+    patch:
+      default:
+        threshold: 5%