fix: [make] be sure the version of misp_modules installed are the one

for generating the documentation.

Makefile

@@ -3,6 +3,7 @@
 .PHONY: prepare_docs generate_docs ci_generate_docs test_docs
 
 prepare_docs:
+ pip3 install .
  cd documentation; python3 generate_documentation.py
  mkdir -p docs/expansion/logos docs/export_mod/logos docs/import_mod/logos
  mkdir -p docs/logos