chore(deps): bump codecov/codecov-action from 5 to 6

Bumps [codecov/codecov-action](https://github.com/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
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/Test.yml

@@ -75,7 +75,7 @@ jobs:
       - uses: julia-actions/julia-processcoverage@v1
         with:
           directories: ./DifferentiationInterface/src,./DifferentiationInterface/ext,./DifferentiationInterface/test
-      - uses: codecov/codecov-action@v5
+      - uses: codecov/codecov-action@v6
         with:
           files: lcov.info
           flags: DI
@@ -150,7 +150,7 @@ jobs:
       - uses: julia-actions/julia-processcoverage@v1
         with:
           directories: ./DifferentiationInterface/src,./DifferentiationInterface/ext,./DifferentiationInterface/test
-      - uses: codecov/codecov-action@v5
+      - uses: codecov/codecov-action@v6
         with:
           files: lcov.info
           flags: DI
@@ -209,7 +209,7 @@ jobs:
       - uses: julia-actions/julia-processcoverage@v1
         with:
           directories: ./DifferentiationInterfaceTest/src,./DifferentiationInterfaceTest/ext,./DifferentiationInterfaceTest/test
-      - uses: codecov/codecov-action@v5
+      - uses: codecov/codecov-action@v6
         with:
           files: lcov.info
           flags: DIT