Bump coverallsapp/github-action from 2.3.4 to 2.3.6 (#295)

Bumps [coverallsapp/github-action](https://github.com/coverallsapp/github-action) from 2.3.4 to 2.3.6.
- [Release notes](https://github.com/coverallsapp/github-action/releases)
- [Commits](coverallsapp/github-action@v2.3.4...v2.3.6)

---
updated-dependencies:
- dependency-name: coverallsapp/github-action
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/nightly.yml

@@ -36,7 +36,7 @@ jobs:
         run: yarn coverage
 
       - name: spot-contracts report coverage
-        uses: coverallsapp/[email protected].4
+        uses: coverallsapp/[email protected].6
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           path-to-lcov: "./coverage/lcov.info"