python314Packages.zigpy: do not install development tools

otherwise building a python env with zha fails like:
  pkgs.buildEnv error: two given paths contain a conflicting subpath:
    `/nix/store/n33xzvpshdigw47iq57v5m71hi90ckk1-python3.13-zigpy-2.0.0/lib/python3.13/site-packages/tools/__pycache__/__init__.cpython-313.opt-1.pyc' and
    `/nix/store/mc1zg3b3a5v2pgvip56zminvjknpx1fp-python3.13-zha-2.0.0/lib/python3.13/site-packages/tools/__pycache__/__init__.cpython-313.opt-1.pyc'
  hint: this may be caused by two different versions of the same package in buildEnv's `paths` parameter

pkgs/development/python-modules/zigpy/default.nix

@@ -37,6 +37,9 @@ buildPythonPackage (finalAttrs: {
     substituteInPlace pyproject.toml \
       --replace-fail '"setuptools-git-versioning<2"' "" \
       --replace-fail 'dynamic = ["version"]' 'version = "${finalAttrs.version}"'
+
+    # do not install development tools
+    rm -r tools
   '';
 
   build-system = [ setuptools ];