NXPY-270: Upgrade Python version

[S-Ghosh-Dev2]

Summary by Sourcery

Upgrade the project’s CI workflows to use Python 3.13.1 instead of 3.9 across testing and release pipelines.

CI:

• Update functional, unit, lint, and type-check GitHub Actions workflows to run on Python 3.13.1.
• Adjust Codecov upload condition syntax in test workflows to the recommended GitHub Actions expression form.

Documentation:

• Prepare changelog for documenting the Python version upgrade.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates GitHub Actions workflows to use Python 3.13.1 instead of 3.9 across tests, lint, types, and release pipelines, and simplifies the Codecov conditional expression syntax.

File-Level Changes

Change	Details	Files
Upgrade CI test matrices to run against Python 3.13.1.	Update the Python version in the functional tests workflow matrix from 3.9 to 3.13.1. Update the Python version in the unit tests workflow matrix from 3.9 to 3.13.1.	.github/workflows/functional_tests.yml .github/workflows/unit_tests.yml
Upgrade Python version used for linting and type-checking workflows to 3.13.1.	Change the configured Python version from 3.9 to 3.13.1 in the lint workflow. Change the configured Python version from 3.9 to 3.13.1 in the types workflow.	.github/workflows/lint.yml .github/workflows/types.yml
Upgrade Python version used in release workflows to 3.13.1.	Update the wheel build job to use Python 3.13.1 instead of 3.9. Update the sdist build job to use Python 3.13.1 instead of 3.9.	.github/workflows/release.yml
Normalize Codecov upload condition syntax in test workflows.	Replace the verbose `${{ success() }}

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[sourcery-ai]

Hey - I've left some high level feedback:

• The inline comments in the workflows still reference 3.9 and 3.10 being in alpha; these should be updated or removed to avoid confusion now that the max version is 3.13.1.
• Consider using a major.minor version specifier (e.g., 3.13 instead of 3.13.1) in actions/setup-python and the matrices to reduce churn when patch versions are updated.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The inline comments in the workflows still reference 3.9 and 3.10 being in alpha; these should be updated or removed to avoid confusion now that the max version is 3.13.1.
- Consider using a major.minor version specifier (e.g., `3.13` instead of `3.13.1`) in `actions/setup-python` and the matrices to reduce churn when patch versions are updated.

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[Copilot]

Pull request overview

Updates the repository’s CI/release configuration to run against a newer Python version as part of NXPY-270.

Changes:

• Bump GitHub Actions workflow Python versions from 3.9 to 3.13.1 (tests, lint, types, release).
• Fix Codecov upload step if: expression syntax in unit/functional test workflows.
• Add NXPY-270 entry and update the 6.1.3 release-date placeholder in the changelog.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
CHANGELOG.rst	Adds NXPY-270 and updates the 6.1.3 release-date placeholder year.
.github/workflows/unit_tests.yml	Runs unit tests on Python 3.13.1; adjusts Codecov upload condition.
.github/workflows/functional_tests.yml	Runs functional tests on Python 3.13.1; adjusts Codecov upload condition.
.github/workflows/lint.yml	Runs lint job on Python 3.13.1.
.github/workflows/types.yml	Runs type-check job on Python 3.13.1.
.github/workflows/release.yml	Builds wheel/sdist on Python 3.13.1.

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