jandelgado/gcov2lcov-action is deprecated

ref. jandelgado/gcov2lcov-action@9a62e29

Author: sue445

.github/workflows/build.yml

@@ -77,17 +77,12 @@ jobs:
       # FIXME: workaround for gcov2lcov warning
       - run: rm -rf vendor/
 
-      - name: Convert coverage to lcov
-        uses: jandelgado/gcov2lcov-action@v1
-        with:
-          infile: coverage.out
-          outfile: coverage.lcov
-
       - name: Coveralls
-        uses: coverallsapp/github-action@master
+        uses: coverallsapp/github-action@v2
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
-          path-to-lcov: coverage.lcov
+          file: coverage.out
+          format: golang
         continue-on-error: true # NOTE: secrets cannot be obtained with forked repository PR
 
       - name: Slack Notification (not success)