use tokenless authentication for codecov

Author: Techatrix

.github/workflows/main.yml

@@ -49,9 +49,8 @@ jobs:
 
       - name: Upload coverage reports to Codecov
         if: github.repository_owner == 'zigtools' && matrix.os == 'ubuntu-latest' && matrix.zig-version == 'master'
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         with:
-          token: ${{ secrets.CODECOV_TOKEN }}
           directory: zig-out/coverage/kcov-merged
           fail_ci_if_error: true
           verbose: true