chore(deps): bump codecov/codecov-action from 3 to 4 (#64)

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3 to 4.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v3...v4)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/CI.yml

@@ -61,7 +61,7 @@ jobs:
           JULIAHUB_SERVER: ${{ secrets.JULIAHUB_SERVER }}
           JULIAHUB_TOKEN: ${{ secrets.JULIAHUB_TOKEN }}
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
         with:
           file: lcov.info
 
@@ -131,7 +131,7 @@ jobs:
           DOCUMENTER_KEY: ${{ secrets.DOCUMENTER_KEY }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
         with:
           file: lcov.info
 
@@ -153,6 +153,6 @@ jobs:
       - name: Check doctests
         run: julia --color=yes --project=docs/ --code-coverage docs/make.jl --doctest
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
         with:
           file: lcov.info