Bump PPT to v2.1.2

[hombit]

The only mayor change is adding Python 3.14 into CI

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.27%. Comparing base (27a7e28) to head (dc4eed9).
⚠️ Report is 69 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #420   +/-   ##
=======================================
  Coverage   97.27%   97.27%           
=======================================
  Files          19       19           
  Lines        2094     2094           
=======================================
  Hits         2037     2037           
  Misses         57       57           

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[github-actions]

Before [27a7e28]	After [1f3b1ea]	Ratio	Benchmark (Parameter)
208±100ms	120±90ms	~0.58	benchmarks.ReadFewColumnsHTTPS.time_run
failed	failed	n/a	benchmarks.ReadFewColumnsS3.peakmem_run
failed	failed	n/a	benchmarks.ReadFewColumnsS3.time_run
11.1±0.2ms	11.5±0.2ms	1.03	benchmarks.NestedFrameAddNested.time_run
29.9±1ms	30.3±2ms	1.01	benchmarks.AssignSingleDfToNestedSeries.time_run
137M	138M	1.01	benchmarks.CountNestedBy.peakmem_run
11.6±0.04ms	11.8±0.1ms	1.01	benchmarks.NestedFrameQuery.time_run
1.49±0.02ms	1.51±0.01ms	1.01	benchmarks.NestedFrameReduce.time_run
103M	103M	1.00	benchmarks.NestedFrameAddNested.peakmem_run
108M	108M	1.00	benchmarks.NestedFrameQuery.peakmem_run

Click here to view all benchmarks.

[hombit]

Blocked by lincc-frameworks/python-project-template#564, let's update PPT after that PR is released