py-topdir.mk: Add --config pyproject.toml

ruff tries to recursivley use every config file it finds and stumbles over a template:
  /usr/bin/ruff check --select TC,FA --fix --unsafe-fixes .
  ruff failed
    Cause: Failed to parse /home/jan/local/src/jw.dev/proj/jw-pkg/conf/templates/pyproject.toml
    Cause: TOML parse error at line 3, column 3
    |
  3 |   {mypypath}
    |   ^
  invalid key-value pair, expected key
Limiting it to the toplevel pyproject.toml by explicitly specifying --config fixes the behaviour, so that's what this commit does.
Signed-off-by: Jan Lindemann <jan@janware.com>

make/py-topdir.mk

@@ -7,6 +7,9 @@ endif
 
 ifndef PY_CHECK_RUFF
   PY_CHECK_RUFF             := $(shell which ruff 2>/dev/null)
+  ifneq ($(PY_CHECK_RUFF),)
+    PY_CHECK_RUFF           += --config pyproject.toml
+  endif
 endif
 
 ifndef PY_CHECK_YAPF