mkosi: install python3-clang in the tools image

tools/check-argument-comments.py needs the libclang python bindings.

mkosi/mkosi.tools.conf/mkosi.conf.d/centos-fedora.conf

@@ -10,6 +10,7 @@ Packages=
         bindgen-cli
         clang-tools-extra
         clippy
+        python3-clang
         python3-mypy
         rpm-build
         libasan

mkosi/mkosi.tools.conf/mkosi.conf.d/debian-ubuntu.conf

@@ -10,6 +10,7 @@ Packages=
         bindgen
         clang-tidy
         coccinelle
+        python3-clang
         lcov
         mypy
         rust-clippy

mkosi/mkosi.tools.conf/mkosi.conf.d/opensuse.conf

@@ -12,6 +12,7 @@ Packages=
         lcov
         libtss2-tcti-device0
         mypy
+        python3-clang
         python3-ruff
         rpm-build
         rust