update-metadata.txt

l3build save -eluatex,pdftex test-artifact-group     test-empty-mc     test-links-backend     test-local-inactive-mc     test-mc-used-twice-b     test-paratag     test-parent-key     texsource   
l3build save -cconfig-pdftex orphan-02         ptagging-004-p        ptagging-006-p        ptagging-007-p        test-AF-file        test-alttext        test-attribute-dev        test-attribute-name        test-attribute        test-beast-1        test-beast-2        test-fakespace-tagpdf        test-header-footer        test-header-tagging        test-link        test-mc-alt        test-namespace-pdf-article        test-namespace-pdf-book        test-namespace-pdfII-article        test-namespace-pdfII-book        test-pdf        test-ref        test-reset-attributes        test-root-AF        test-saveboxes-structure        test-struct-OBJR 
  
l3build save -cconfig-luatex   issue13-mcid-array    issue14-artifact-bool    issue66-missing-space    test-AF-file    test-alttext    test-attribute    test-fakespace-box    test-fakespace-fontchange    test-fakespace-tagpdf    test-header-footer    test-header-tagging    test-link    test-luatex-pdf    test-mc-alt    test-ref    test-reset-attributes    test-root-AF    test-saveboxes-structure    test-struct-OBJR.luatex.fc