Add Codecov configuration file to "Test Go" workflow's paths filter

Since this workflow uploads code coverage data to Codecov, the configuration file is relevant, and so the workflow should
run any time this file is modified.

Author: per1234

Diff for: .github/workflows/test-go-task.yml

@@ -10,6 +10,7 @@ on:
   push:
     paths:
       - ".github/workflows/test-go-task.ya?ml"
+      - "codecov.ya?ml"
       - "go.mod"
       - "go.sum"
       - "Taskfile.ya?ml"
@@ -18,6 +19,7 @@ on:
   pull_request:
     paths:
       - ".github/workflows/test-go-task.ya?ml"
+      - "codecov.ya?ml"
       - "go.mod"
       - "go.sum"
       - "Taskfile.ya?ml"