patch 8.2.4904: codecov includes MS-Windows install files

Problem:    codecov includes MS-Windows install files.
Solution:   Ignore dosinst.c and uninstall.c.
diff --git a/.codecov.yml b/.codecov.yml
index 6140fe9..7c6c8f3 100644
--- a/.codecov.yml
+++ b/.codecov.yml
@@ -4,3 +4,8 @@
     project:
       default:
         threshold: 0.05%
+
+# Files not run by tests
+ignore:
+  - "src/dosinst.c"
+  - "src/uninstall.c"