MetaSearch plugin: CSW catalogue url update

[jgrocha]

Description

URL update of the CSW catalogue of the portuguese mapping agency. The previous one was deprecated and no longer works.

The catalogue administrator was notified by email.

Checklist

• Commit messages are descriptive and explain the rationale for changes
• Commits which fix bugs include Fixes #11111 at the bottom of the commit message
• I have read the QGIS Coding Standards and this PR complies with them
• New unit tests have been added for core changes
• I have run the scripts/prepare-commit.sh script before each commit
• I have evaluated whether it is appropriate for this PR to be backported, backport requests are left as label or comment