Bump versions for 5.7.3

[johngodley]

No description provided.

[Copilot]

Pull request overview

This PR bumps the Redirection WordPress plugin version from 5.7.2 to 5.7.3. The version bump follows a consistent pattern across all necessary files and includes a changelog documenting bug fixes and improvements for this release.

Changes:

• Updated version number from 5.7.2 to 5.7.3 across all version-tracking files
• Updated build hash from 2612cf68d9981df94efc7d166bed264a to 4226b5957b97db33450c269681d4a29e
• Added changelog entry for version 5.7.3 with 4 bug fixes and improvements

Reviewed changes

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

File	Description
redirection.php	Updated plugin header version and fallback version constants
redirection-version.php	Updated version and build constants for cached sites
readme.txt	Updated stable tag and added changelog entry for 5.7.3 release
package.json	Updated npm package version

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