[url_launcher] Remove obsolete LICENSE entry

[stuartmorgan-g]

The third-party code in url_launcher_web was removed in #4330, but we never removed:

• The top-level LICENSE file entry for that code
• The repo tooling allowance for that copyright/license

This removes those remaining pieces.

Part of flutter/flutter#129575

Pre-Review Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the AI contribution guidelines and understand my responsibilities, or I am not using AI tools.
• I read the Tree Hygiene page, which explains my responsibilities.
• I read and followed the relevant style guides and ran the auto-formatter.
• I signed the CLA.
• The title of the PR starts with the name of the package surrounded by square brackets, e.g. [shared_preferences]
• I linked to at least one issue that this PR fixes in the description above.
• I followed the version and CHANGELOG instructions, using semantic versioning and the repository CHANGELOG style, or I have commented below to indicate which documented exception this PR falls under¹.
• I updated/added any relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or I have commented below to indicate which test exemption this PR falls under¹.
• All existing and new tests are passing.

Footnotes

1. Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling. ↩ ↩²

[flutter-dashboard]

This pull request is not mergeable in its current state, likely because of a merge conflict. Pre-submit CI jobs were not triggered. Pushing a new commit to this branch that resolves the issue will result in pre-submit jobs being scheduled.

[gemini-code-assist]

Code Review

This pull request increments the version of google_maps_flutter_web to 0.6.2+1 and updates its changelog. However, the license modifications and tool regex removals were applied to url_launcher_web instead of the intended package. Feedback indicates that the wrong license file and regex were likely modified, as the changes do not align with the package being versioned.

[stuartmorgan-g]

Trying again, this time without forgetting which of the web packages with third-party code I was actually changing...