[dependabot]: Bump the actions group with 2 updates (mne-tools#13817)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: mne[bot] <50266005+mne-bot@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/tests.yml

@@ -143,7 +143,7 @@ jobs:
             fi
           fi
         if: matrix.kind == 'conda' || matrix.kind == 'mamba'
-      - uses: mamba-org/setup-micromamba@v2
+      - uses: mamba-org/setup-micromamba@v3
         with:
           environment-file: ${{ env.CONDA_ENV }}
           environment-name: mne
@@ -182,7 +182,7 @@ jobs:
           path: ~/mne_data
       - run: bash ./tools/github_actions_download.sh
       - run: bash ./tools/github_actions_test.sh  # for some reason on macOS we need to run "bash X" in order for a failed test run to show up
-      - uses: codecov/codecov-action@v5
+      - uses: codecov/codecov-action@v6
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
         if: success() || failure()