CI: Bump codecov/codecov-action

Bumps the github-actions group with 1 update in the / directory: [codecov/codecov-action](https://github.com/codecov/codecov-action).

Updates `codecov/codecov-action` from 5 to 6
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v5...v6)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

closes: #19910

Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -405,7 +405,7 @@ jobs:
       - name: Codecov
         timeout-minutes: 20
         if: matrix.coverage
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v6
         with:
           flags: linux,${{ matrix.features }}-${{ matrix.compiler }}-${{ join(matrix.extra, '-') }}
           token: ${{ secrets.CODECOV_TOKEN }}
@@ -846,7 +846,7 @@ jobs:
       - name: Codecov
         timeout-minutes: 20
         if: matrix.coverage
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v6
         with:
           directory: src
           flags: windows,${{ matrix.toolchain }}-${{ matrix.arch }}-${{ matrix.features }}