Bump version after release + npm audit fix + merges from 0.12.5

[bwateratmsft]

No description provided.

[Copilot]

Pull request overview

Routine post-release housekeeping: bumps the extension version to the next alpha after the 0.12.5 release, updates the changelog with the 0.12.5 entry, and applies npm audit fix updates (refreshing transitive dependency versions in package-lock.json and regenerating NOTICE.html).

Changes:

• Bump version from 0.12.4 to 0.12.6-alpha.0 in package.json / package-lock.json.
• Add 0.12.5 release notes to CHANGELOG.md.
• Refresh transitive dependency versions (brace-expansion, mocha, etc.) and regenerate third-party NOTICE.html.

Reviewed changes

Copilot reviewed 2 out of 4 changed files in this pull request and generated no comments.

File	Description
package.json	Version bump to 0.12.6-alpha.0.
package-lock.json	Version bump and transitive dependency updates from npm audit fix.
CHANGELOG.md	Adds 0.12.5 release notes.
NOTICE.html	Regenerated third-party notices reflecting new/updated dependencies.

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