/etc/resolvconf/update-libc.d/squid-deb-proxy is in squid-deb-proxy 0.8.14.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
PATH="/usr/sbin:/usr/bin:/sbin:/bin"
# Make squid aware of changes to resolv.conf
# Avoid reload before /usr is mounted
if [ -d /usr/sbin ] ; then
invoke-rc.d squid-deb-proxy reload || true
fi
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