[chore] remove ruff required version

This makes ruff refuse to run if the versions don't match, and apparently
ruff merges all the configuration files it finds or something, so it becomes
impossible to run an up-to-date ruff on a mixed project without using
`--ignore` or `--config` specifically.

Part of odoo/upgrade#5175

Signed-off-by: Christophe Simonis (chs) <[email protected]>

Author: xmo-odoo

pyproject.toml

@@ -2,7 +2,6 @@
 line-length = 120
 
 [tool.ruff]
-required-version = "0.0.288"
 fix = true
 show-fixes = true
 ignore = [