Bump ecliptical/covdir-report-action from 0.3 to 0.4 (#71)

Bumps [ecliptical/covdir-report-action](https://github.com/ecliptical/covdir-report-action) from 0.3 to 0.4.
- [Release notes](https://github.com/ecliptical/covdir-report-action/releases)
- [Commits](ecliptical/covdir-report-action@v0.3...v0.4)

---
updated-dependencies:
- dependency-name: ecliptical/covdir-report-action
  dependency-version: '0.4'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -68,7 +68,7 @@ jobs:
           RUSTFLAGS: '-Cinstrument-coverage'
           LLVM_PROFILE_FILE: 'target/coverage/%p-%m.profraw'
       - name: Generate coverage report
-        uses: ecliptical/covdir-report-action@v0.3
+        uses: ecliptical/covdir-report-action@v0.4
         with:
           summary: 'true'
           out: ./target/coverage.md