chore: Drop support for python 2 and thumbor 6

[fdintino]

No description provided.

[github-actions]

Unit Test Results

    6 files  ± 0      6 suites  ±0   2m 32s ⏱️ -18s
  175 tests  - 12    175 ✅  - 12   0 💤 ± 0  0 ❌ ±0 
1 050 runs   - 58  1 036 ✅  - 10  14 💤  - 48  0 ❌ ±0 

Results for commit 8f71c6d. ± Comparison against base commit 507ecac.

This pull request removes 12 tests.

tests.result_storages.test_s3_storage ‑ test_normalize_path_tc_aws_settings
tests.result_storages.test_s3_storage ‑ test_s3_result_storage_load[unsafe/hotdog.gif-image/gif-*/*-False]
tests.result_storages.test_s3_storage ‑ test_s3_result_storage_load[unsafe/hotdog.gif-image/gif-*/*-True]
tests.result_storages.test_s3_storage ‑ test_s3_result_storage_load[unsafe/hotdog.gif/mp4-video/mp4-video/*-False]
tests.result_storages.test_s3_storage ‑ test_s3_result_storage_load[unsafe/hotdog.gif/mp4-video/mp4-video/*-True]
tests.result_storages.test_s3_storage ‑ test_s3_result_storage_load[unsafe/hotdog.gif/webp-image/webp-image/webp-False]
tests.result_storages.test_s3_storage ‑ test_s3_result_storage_load[unsafe/hotdog.gif/webp-image/webp-image/webp-True]
tests.result_storages.test_s3_storage ‑ test_s3_result_storage_load[unsafe/hotdog.png-image/png-*/*-False]
tests.result_storages.test_s3_storage ‑ test_s3_result_storage_load[unsafe/hotdog.png-image/png-*/*-True]
tests.result_storages.test_s3_storage ‑ test_s3_result_storage_save[-image/gif]
…

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.80%. Comparing base (507ecac) to head (8f71c6d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
- Coverage   95.74%   93.80%   -1.95%     
==========================================
  Files          17       17              
  Lines         870      855      -15     
  Branches      180      144      -36     
==========================================
- Hits          833      802      -31     
- Misses         29       48      +19     
+ Partials        8        5       -3     

Files with missing lines	Coverage Δ
src/thumbor_video_engine/app.py	100.00% <100.00%> (+16.98%)	⬆️
src/thumbor_video_engine/filters/format.py	100.00% <100.00%> (ø)
src/thumbor_video_engine/filters/lossless.py	100.00% <100.00%> (ø)
src/thumbor_video_engine/filters/still.py	100.00% <100.00%> (ø)
src/thumbor_video_engine/filters/tune.py	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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