Adds matplotlib-inline to license exceptions

[kellyguo11]

Description

matplotlib-inline has BSD-3 license, so it's ok for us to include it. We already have the license file specified for it.

Type of change

• Documentation update

Checklist

• I have read and understood the contribution guidelines
• I have run the pre-commit checks with ./isaaclab.sh --format
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have updated the changelog and the corresponding version in the extension's config/extension.toml file
• I have added my name to the CONTRIBUTORS.md or my name already exists there

[greptile-apps]

Greptile Overview

Greptile Summary

This PR adds matplotlib-inline to the repository's license exceptions list in .github/workflows/license-exceptions.json. The matplotlib-inline package is a dependency that reports its license as "UNKNOWN" in package metadata, but is actually distributed under the BSD-3-Clause license, making it compatible with Isaac Lab's BSD-3-Clause license. The repository already contains the license file at docs/licenses/dependencies/matplotlib-inline-license.txt. This change follows the established pattern in the exceptions file where packages with unclear metadata but verified compatible licenses are explicitly whitelisted to allow CI license validation workflows to pass. The entry includes a comment field documenting the actual BSD-3 license type for maintainer reference.

Important Files Changed

Filename	Score	Overview
.github/workflows/license-exceptions.json	5/5	Adds matplotlib-inline package to the license exceptions array with BSD-3 comment

Confidence score: 5/5

• This PR is safe to merge with minimal risk
• Score reflects a simple, well-formatted JSON addition that follows existing patterns and addresses a legitimate CI validation issue for a license-compatible dependency
• No files require special attention

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[greptile-apps]

Greptile Overview

Greptile Summary

This PR corrects a JSON syntax error in the license exceptions file by removing a trailing comma after the last array element. The .github/workflows/license-exceptions.json file already contained the matplotlib-inline package entry with its BSD-3 license designation; this change simply removes the non-standard trailing comma to ensure strict JSON compliance. This file appears to be used in CI/CD workflows to track dependencies whose licenses have been reviewed and approved for inclusion in Isaac Lab, despite potentially having non-standard license metadata in their package definitions.

Important Files Changed

Filename	Score	Overview
.github/workflows/license-exceptions.json	5/5	Removed trailing comma after the final array element to ensure strict JSON compliance

Confidence score: 5/5

• This PR is safe to merge with minimal risk and contains only a syntax correction.
• Score reflects that this is a trivial formatting fix with no functional changes; the removal of a trailing comma cannot introduce bugs or break existing functionality.
• No files require special attention; this is a straightforward JSON syntax correction.

_{1 file reviewed, no comments}

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