build-installers: adapt to latest Ruby version

To be able to run AsciiDoctor, Git for Windows requires Ruby. MSYS2
recently updated Ruby from v3.1.5 to v3.3.0, which requires updates to
the `build-installers` sparse-checkout definition.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

.sparse/makepkg-git

@@ -86,6 +86,8 @@
 /mingw32/lib/ruby/*/did_you_mean*
 /mingw32/lib/ruby/*/cgi/util*
 /mingw32/lib/ruby/*/logger*
+/mingw32/lib/ruby/*/bundled_gems.rb
+/mingw32/lib/ruby/*/syntax_suggest*
 
 # xsltproc (e.g. for Git's user-manual.html)
 /usr/bin/xsltproc.exe