build: drop pre-commit from runtime dependencies

The Docker commit added pre-commit to [project] dependencies, so every
install of pqcli pulled it in. It is a development tool, and the hooks
run through prek from the dev group now.

pyproject.toml

@@ -23,7 +23,6 @@ dependencies = [
     "xdg-base-dirs>=6.0.0,<7.0.0",
     "urwid>=2.1.2,<3.0.0",
     "urwid-readline>=0.13,<1.0.0",
-    "pre-commit>=4.5.0",
 ]
 
 [project.optional-dependencies]