Replace broken link for Sun Public License SPL 1.0

[alok1304]

Fixes #3948
Replacing broken link for Sun Public License SPL 1.0 i.e change https://opensource.org/licenses/SPL-1.0 to https://opensource.org/license/sunpublic-php.

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]

[AyanSinhaMahapatra]

Thanks @alok1304, update_spl_url sounds like variable name, not a commit message title. Could you amend your commit to have a nice title? Similarly like you have in the PR. See also https://aboutcode.readthedocs.io/en/latest/contributing/writing_good_commit_messages.html

[AyanSinhaMahapatra]

Thanks++ @alok1304 Merging!