chore(ci): remove LEFTHOOK_QUIET env

It no longer exists in lefthook 2. I suppose the default output is not
that bad anyway, so let's not bother replacing with LEFTHOOK_OUTPUT at
least for now.

Author: scop

.github/workflows/check.yaml

@@ -24,5 +24,4 @@ jobs:
       - name: Check code
         env:
           FORCE_COLOR: true
-          LEFTHOOK_QUIET: meta,execution
         run: lefthook run pre-commit --all-files --force --no-tty