Runner hyWymp6uF has started failing

All jobs taken by the x86_64-linux-perf runner hyWymp6uF now fail with:

Preparing environment 00:00
ERROR: Job failed (system failure): prepare environment: http: invalid Host header (exec.go:71:0s). Check https://docs.gitlab.com/runner/shells/index.html#shell-profile-loading for more information

See, for instance, https://gitlab.haskell.org/ghc/ghc/-/jobs/1612163.