ci: Group dependabot updates

[matthewfeickert]

• Group dependabot updates to reduce the number of PRs.
  • c.f. sp-repo-review GH212: Require GHA update grouping https://learn.scientific-python.org/development/guides/gha-basic/#GH212

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.17%. Comparing base (0f290e3) to head (a02ee97). Report is 7 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #242 +/- ## ======================================= Coverage 91.17% 91.17% ======================================= Files 2 2 Lines 306 306 Branches 83 83 ======================================= Hits 279 279 Misses 17 17 Partials 10 10 ``` | [Flag](https://app.codecov.io/gh/scikit-hep/pylhe/pull/242/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scikit-hep) | Coverage Δ | | |---|---|---| | [unittests-3.10](https://app.codecov.io/gh/scikit-hep/pylhe/pull/242/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scikit-hep) | `90.84% <ø> (ø)` | | | [unittests-3.11](https://app.codecov.io/gh/scikit-hep/pylhe/pull/242/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scikit-hep) | `90.84% <ø> (ø)` | | | [unittests-3.12](https://app.codecov.io/gh/scikit-hep/pylhe/pull/242/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scikit-hep) | `90.84% <ø> (ø)` | | | [unittests-3.8](https://app.codecov.io/gh/scikit-hep/pylhe/pull/242/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scikit-hep) | `90.84% <ø> (ø)` | | | [unittests-3.9](https://app.codecov.io/gh/scikit-hep/pylhe/pull/242/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scikit-hep) | `90.84% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scikit-hep#carryforward-flags-in-the-pull-request-comment) to find out more.

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