/etc/logcheck/ignore.d.workstation/squid is in logcheck-database 1.3.14.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | ^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ squid\[[[:digit:]]+\]: Reconfiguring Squid Cache \(version [.[:alnum:]]+\)\.\.\.$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ squid\[[[:digit:]]+\]: Squid Cache \(Version [[:digit:].]+(STABLE)*[[:digit:]]+\): Exiting normally\.$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ squid\[[[:digit:]]+\]: Starting Squid Cache version [[:digit:].]+(STABLE)*[[:digit:]]+ for [[:alnum:]-]+\.\.\.$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ squid\[[[:digit:]]+\]: squidaio_queue_request: WARNING - Queue congestion$
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