Update dependency buildfarm-client to v18

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This PR contains the following updates:

Package	Update	Change
buildfarm-client	major	17 -> 18

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Release Notes

PGBuildFarm/client-code (buildfarm-client)

v18: Release 18

Compare Source

In addition to numerous minor tweaks and bug fixes, the following changes are made:

•   many improvements in the collection of log files
  

•   accommodate change in data checksum default in cross version upgrade testing
  

•   increase default PGCTLTIMEOUT to 180s
  

•   improve "safe" environment set, including all in the build_env configuration settings
  

•   on script timeout, don't just fail but send the result to the server (Note: the timeout mechanism doesn't work on Windows, and has been disabled there)
  

•   set the default timeout to 4 hours.
  

•   remove redundant TestDecoding module
  

•   add a module for running "make dist"
  

•   improve detection of failures when running with meson
  

•   add README files to the set ignored by the sample trigger_exclude setting.
  

Upgrading is highly recommended.

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