removing unnecessary tensorflow dependency

[gregory-halverson-jpl]

tensorflow was used for the artification neural network implementation of FLiES before the look-up table implementation was split off into its own package, but tensorflow is not required for the look-up table implementation

[gregory-halverson]

Both tensorflow and keras need to be removed from this package to expand compatibility

[Copilot]

Pull Request Overview

This PR removes the unneeded tensorflow (and related keras) dependency following the split of the LUT implementation into its own package, and bumps the package version while extending CI testing.

• Remove keras and tensorflow from test imports and project dependencies
• Bump version from 1.0.2 to 1.0.3 in pyproject.toml and version.txt
• Expand GitHub Actions Python test matrix to include 3.11–3.13

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
tests/test_import_dependencies.py	Drop keras/tensorflow entries from import tests
pyproject.toml	Remove keras/tensorflow deps; bump version
FLiESLUT/version.txt	Bump library version to 1.0.3
.github/workflows/ci.yml	Add Python 3.11, 3.12, 3.13 to CI matrix

Comments suppressed due to low confidence (2)

pyproject.toml:6

• Consider updating the project's CHANGELOG.md or release notes to document the removal of the tensorflow dependency and the version bump to 1.0.3.

version = "1.0.3"

.github/workflows/ci.yml:16

• [nitpick] You might consider aligning the tested Python versions exactly with the supported versions declared in requires-python (>=3.10) and dropping early EOL versions if needed.

        python-version: ["3.10", "3.11", "3.12", "3.13"]