Refine postgresql RULE

[alok1304]

Fixes #4010

Tasks

• Reviewed contribution guidelines
• PR is descriptively titled 📑 and links the original issue above 🔗
• Tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR
  Run tests locally to check for errors.
• Commits are in uniquely-named feature branch and has no merge conflicts 📁
• Updated documentation pages (if applicable)
• Updated CHANGELOG.rst (if applicable)

Signed-off-by: Alok Kumar [email protected]

[alok1304]

I am trying to add new rule for https://raw.githubusercontent.com/pgvector/pgvector/refs/heads/master/LICENSE
But this is already in the src/licensedcode/data/rules/postgresql_8.RULE this match exactly same.