/usr/share/puppet/modules.available/puppetlabs-apache/templates/mod/reqtimeout.conf.erb is in puppet-module-puppetlabs-apache 3.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | <% Array(@timeouts).each do |timeout| -%>
RequestReadTimeout <%= timeout %>
<%- end -%>
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