sysutils/modules: Update to 5.7.0
- Use the Tcl interpreter selected by the ports framework
- Add missing runtime bash dependency and SHEBANG_FILES for envml
- Drop the unnecessary Sphinx build dependency
- Fix Portscout release detection
Release notes:
https://github.com/envmodules/modules/releases/tag/v5.7.0
Approved by: thierry (mentor, implicit)