CI: replace macOS-11 with macOS-14

[awaelchli]

What does this PR do?

The macOS-11 image for our GitHub actions was deprecated and removed recently, which is why the jobs are not starting. See https://github.blog/changelog/2024-05-20-actions-upcoming-changes-to-github-hosted-macos-runners/

This PR replaces all macOS-11 with macOS-14.

---

📚 Documentation preview 📚: https://pytorch-lightning--20029.org.readthedocs.build/en/20029/

cc @Borda

[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 pytorch_lightning: Tests workflow

Check ID	Status
pl-cpu (macOS-13, lightning, 3.8, 2.0, oldest)	success	✅
pl-cpu (macOS-14, lightning, 3.10, 2.0)	success	✅
pl-cpu (macOS-14, lightning, 3.10, 2.1)	success	✅
pl-cpu (macOS-14, lightning, 3.10, 2.2)	success	✅
pl-cpu (macOS-14, lightning, 3.10, 2.3)	success	✅
pl-cpu (ubuntu-20.04, lightning, 3.8, 2.0, oldest)	success	✅
pl-cpu (ubuntu-20.04, lightning, 3.10, 2.0)	success	✅
pl-cpu (ubuntu-20.04, lightning, 3.10, 2.1)	success	✅
pl-cpu (ubuntu-20.04, lightning, 3.10, 2.2)	success	✅
pl-cpu (ubuntu-20.04, lightning, 3.10, 2.3)	success	✅
pl-cpu (windows-2022, lightning, 3.8, 2.0, oldest)	success	✅
pl-cpu (windows-2022, lightning, 3.10, 2.0)	success	✅
pl-cpu (windows-2022, lightning, 3.10, 2.1)	success	✅
pl-cpu (windows-2022, lightning, 3.10, 2.2)	success	✅
pl-cpu (windows-2022, lightning, 3.10, 2.3)	success	✅
pl-cpu (macOS-14, pytorch, 3.8, 2.0)	success	✅
pl-cpu (ubuntu-20.04, pytorch, 3.8, 2.0)	success	✅
pl-cpu (windows-2022, pytorch, 3.8, 2.0)	success	✅
pl-cpu (macOS-12, pytorch, 3.11, 2.0)	success	✅
pl-cpu (macOS-12, pytorch, 3.11, 2.1)	success	✅
pl-cpu (ubuntu-22.04, pytorch, 3.11, 2.0)	success	✅
pl-cpu (ubuntu-22.04, pytorch, 3.11, 2.1)	success	✅
pl-cpu (windows-2022, pytorch, 3.11, 2.0)	success	✅
pl-cpu (windows-2022, pytorch, 3.11, 2.1)	success	✅

These checks are required after the changes to .github/workflows/ci-tests-pytorch.yml.

🟢 lightning_fabric: CPU workflow

Check ID	Status
fabric-cpu (macOS-13, lightning, 3.8, 2.0, oldest)	success	✅
fabric-cpu (macOS-14, lightning, 3.10, 2.0)	success	✅
fabric-cpu (macOS-14, lightning, 3.11, 2.1)	success	✅
fabric-cpu (macOS-14, lightning, 3.11, 2.2)	success	✅
fabric-cpu (macOS-14, lightning, 3.10, 2.3)	success	✅
fabric-cpu (ubuntu-20.04, lightning, 3.8, 2.0, oldest)	success	✅
fabric-cpu (ubuntu-20.04, lightning, 3.10, 2.0)	success	✅
fabric-cpu (ubuntu-20.04, lightning, 3.11, 2.1)	success	✅
fabric-cpu (ubuntu-20.04, lightning, 3.11, 2.2)	success	✅
fabric-cpu (ubuntu-20.04, lightning, 3.11, 2.3)	success	✅
fabric-cpu (windows-2022, lightning, 3.8, 2.0, oldest)	success	✅
fabric-cpu (windows-2022, lightning, 3.10, 2.0)	success	✅
fabric-cpu (windows-2022, lightning, 3.11, 2.1)	success	✅
fabric-cpu (windows-2022, lightning, 3.11, 2.2)	success	✅
fabric-cpu (windows-2022, lightning, 3.11, 2.3)	success	✅
fabric-cpu (macOS-14, fabric, 3.8, 2.0)	success	✅
fabric-cpu (ubuntu-20.04, fabric, 3.8, 2.0)	success	✅
fabric-cpu (windows-2022, fabric, 3.8, 2.0)	success	✅
fabric-cpu (macOS-12, fabric, 3.11, 2.0)	success	✅
fabric-cpu (macOS-12, fabric, 3.11, 2.1)	success	✅
fabric-cpu (ubuntu-22.04, fabric, 3.11, 2.0)	success	✅
fabric-cpu (ubuntu-22.04, fabric, 3.11, 2.1)	success	✅
fabric-cpu (windows-2022, fabric, 3.11, 2.0)	success	✅
fabric-cpu (windows-2022, fabric, 3.11, 2.1)	success	✅

These checks are required after the changes to .github/workflows/ci-tests-fabric.yml.

---

Thank you for your contribution! 💜

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56%. Comparing base (2524864) to head (bff2b6a).
Report is 74 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (2524864) and HEAD (bff2b6a). Click for more details.

HEAD has 402 uploads less than BASE

Flag	BASE (2524864)	HEAD (bff2b6a)
python3.10	35	16
cpu	145	48
lightning	86	30
pytest	103	24
gpu	4	0
lightning_fabric	25	9
pytorch_lightning	20	9
examples	9	0
app	9	0
tpu	2	0
python3.8	25	12
python3.11	50	20
lightning_app	9	0
pytorch2.3	7	3
pytest-full	48	24
pytorch2.0	24	12
pytorch2.1	12	6
pytorch2.2	5	3

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #20029     +/-   ##
=========================================
- Coverage      84%      56%    -28%     
=========================================
  Files         427      422      -5     
  Lines       35505    35407     -98     
=========================================
- Hits        29782    19890   -9892     
- Misses       5723    15517   +9794