karellen / kubernator

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Fix CPython deprecation warnings; bump json-log-formatter and jsonpath-ng (#105)

## Summary

- Bump `json-log-formatter` from `~=0.3` to `~=1.0` — the old version
used `datetime.utcnow()`, deprecated since Python 3.12
- Bump `jsonpath-ng` from `~=1.7.0` to `~=1.8` — adapt `Index.index` →
`Index.indices[0]` for the 1.8 API change
- Add `filter='data'` to `tarfile.extractall()` in `helm.py`,
`istio.py`, and `issue_27_tests.py` (version-guarded for 3.10/3.11
compat) — fixes tarfile extraction filter DeprecationWarning on Python
3.12+
- Add `smoke_json_log_tests.py` integration test covering the JSON log
format code path

## Test plan

- [x] Full build passes on Python 3.13.11 with zero CPython warnings
(excluding gevent fork)
- [x] JSON log format verified manually (`kubernator --log-format json`)
- [x] New `smoke_json_log_tests` integration test validates JSON log
output structure
- [x] CI matrix (3.10–3.14) passes

1078 of 1494 branches covered (72.16%)

Branch coverage included in aggregate %.

5 of 5 new or added lines in 3 files covered. (100.0%)

4436 of 5227 relevant lines covered (84.87%)

4.23 hits per line