Fix lua and xml backup

[eloiferrer]

MaRDI Pull Request

Changes:

• Adding Lua development packages to fix this php warning:

  Warning: PHP Startup: Unable to load dynamic library 'luasandbox' 
  (tried: /usr/local/lib/php/extensions/no-debug-non-zts-20210902/luasandbox 
  (/usr/local/lib/php/extensions/no-debug-non-zts-20210902/luasandbox: cannot open shared object file: No such file or directory), 
  /usr/local/lib/php/extensions/no-debug-non-zts-20210902/luasandbox.so (liblua5.1.so.0: cannot open shared object file: No such file or directory)) in Unknown on line 0

• Filter namespaces in XML backup to include only those <= 3000. See NamespaceInfo.

Instructions for PR review:

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

Checklist for this PR:

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