/etc/mercurial/hgrc.d/cacerts.rc is in mercurial-common 3.1.2-2+deb8u4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# user can disable this Debian default by overriding this option in ~/.hgrc
# and/or using the --insecure command line switch
cacerts = /etc/ssl/certs/ca-certificates.crt
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