jsonargparse 4.39 required for CLI, check at run-time

[adamjstewart]

What does this PR do?

jsonargparse 4.39 has been required by LightningCLI since #20777, and jsonnet has been required since #20899, both in lightning 2.5.2. However, we forgot to update other run-time checks for this, resulting in users not being warned about incompatible jsonargparse installations.

Fixes torchgeo/torchgeo#3741 (comment)

@Borda @robmarkcole

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79%. Comparing base (932b7e3) to head (8d97792).
✅ All tests successful. No failed tests found.
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HEAD has 538 uploads less than BASE

Flag	BASE (932b7e3)	HEAD (8d97792)
cpu	166	42
python	12	3
lightning_fabric	54	0
pytest	82	0
python3.12	48	12
python3.13	36	9
lightning	58	15
python3.11	23	6
python3.12.7	35	9
python3.10	12	3
pytorch2.5.1	6	3
pytest-full	84	42
pytorch2.8	12	6
pytorch_lightning	54	27
pytorch2.9	12	6
pytorch2.10	12	6
pytorch2.1	12	6
pytorch2.2.2	6	3
pytorch2.3	6	3
pytorch2.7	6	3
pytorch2.6	6	3
pytorch2.4.1	6	3

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #21747     +/-   ##
=========================================
- Coverage      87%      79%     -8%     
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  Files         270      267      -3     
  Lines       23973    23914     -59     
=========================================
- Hits        20748    18803   -1945     
- Misses       3225     5111   +1886