chore(tests): [codecov] add flags.node20

Signed-off-by: Lexus Drumgold <[email protected]>

Author: unicornware

.codecov.yml

@@ -4,12 +4,12 @@
 ---
 codecov:
   notify:
-    after_n_builds: 3
+    after_n_builds: 4
     wait_for_ci: true
   require_ci_to_pass: true
 
 comment:
-  after_n_builds: 3
+  after_n_builds: 4
   behavior: default
   layout: header,diff,flags,tree,footer
   require_base: false
@@ -64,6 +64,10 @@ coverage:
         threshold: 0%
 
 flags:
+  node20:
+    carryforward: false
+    paths:
+      - src/
   node19:
     carryforward: false
     paths: