python3.11 compatibility; is_tll to mtd_kde

[TY-Cheng]

modify f-string for python3.11 compatibility;
is_tll to mtd_kde for more KDE to come.

[Copilot]

Pull Request Overview

This PR updates the code to improve Python 3.11 compatibility and renames the parameter is_tll to mtd_kde, along with associated documentation and tests.

• Updated function signatures and docstrings to replace is_tll with mtd_kde.
• Modified project metadata and workflows to target Python 3.11.
• Adjusted examples and tests to reflect the new parameter naming and added plt.close calls in test cleanups.

Reviewed Changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 1 comment.

File	Description
torchvinecopulib/vinecop/init.py	Renamed is_tll to mtd_kde and updated related f-string formatting.
torchvinecopulib/bicop/init.py	Replaced is_tll parameter with mtd_kde; note potential type annotation issue.
tests/.py, examples/, .github/workflows/*, README.md, pyproject.toml	Updated test calls, examples, workflows, and docs for the new parameter and Python version change.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.10% (target: -1.00%)	✅ 87.50%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (bd656a4)	907	877	96.69%
Head commit (83cce29)	909 (+2)	878 (+1)	96.59% (-0.10%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#39)	8	7	87.50%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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