Bump codecov/codecov-action from 3 to 4 (#914)

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>

.github/workflows/merge-pytest.yml

@@ -73,7 +73,7 @@ jobs:
  poetry run coverage xml
  - name: Send coverage results
  if: ${{ success() }}
- uses: codecov/codecov-action@v3
+ uses: codecov/codecov-action@v4
 
  pydicom-dev:
  # Matrix builds with development pydicom
@@ -118,7 +118,7 @@ jobs:
  poetry run coverage xml
  - name: Send coverage results
  if: ${{ success() }}
- uses: codecov/codecov-action@v3
+ uses: codecov/codecov-action@v4
 
  pydicom-release:
  # Matrix builds with released pydicom
@@ -162,4 +162,4 @@ jobs:
  poetry run coverage xml
  - name: Send coverage results
  if: ${{ success() }}
- uses: codecov/codecov-action@v3
+ uses: codecov/codecov-action@v4

.github/workflows/pr-pytest.yml

@@ -79,7 +79,7 @@ jobs:
  poetry run coverage xml
  - name: Send coverage results
  if: ${{ success() }}
- uses: codecov/codecov-action@v3
+ uses: codecov/codecov-action@v4
 
  pydicom-dev:
  # Matrix builds with development pydicom
@@ -124,7 +124,7 @@ jobs:
  poetry run coverage xml
  - name: Send coverage results
  if: ${{ success() }}
- uses: codecov/codecov-action@v3
+ uses: codecov/codecov-action@v4
 
  pydicom-release:
  # Matrix builds with released pydicom
@@ -171,4 +171,4 @@ jobs:
  poetry run coverage xml
  - name: Send coverage results
  if: ${{ success() }}
- uses: codecov/codecov-action@v3
+ uses: codecov/codecov-action@v4