Increase max db connections

[physikerwelt]

It avoids portal 500 problems like

MediaWiki internal error.

Original exception: [80160ebca09a7da5d38eebd3] / Wikimedia\Rdbms\DBConnectionError: Cannot access the database: Too many connections (mysql.svc:3306) Backtrace:

MaRDI Pull Request

Changes:

• Increase max db connections to 1000

Instructions for PR review:

• [ ] Conceptual Review (Logic etc...)
• [ ] Code Review (Review your implementation)
• [ ] Checkout (Test changes locally)

Checklist for this PR:

• [x] Reviewers and Assignee specified.
• [x] All related issues are linked.