Shebang not updated when changing python interpreter

[jmfederico]

• I have searched the issue tracker and believe that this is not a duplicate.

Steps to reproduce

After having a project initialized:

• Install any package that includes a binary. Example pdm add invoke
• Change the python interpreter for the project with pdm use /a/different/python

Actual behavior

• Check the Shebang on the scripts under pypackages/x.x/bin/ and notice that all still use the old python path.

Expected behavior

The Shebangs for all the binaries for the newly selected mayor.minor version of the interpreter should be updated.

Only binaries for the NEW mayor.minor interpreter should be updated.

Environment Information

pdm version:

Python Interpreter: /Users/user/.pyenv/versions/3.8/bin/python3.8 (3.8.2)
Project Root:       /Users/user/development/pdm-test
{
  "implementation_name": "cpython",
  "implementation_version": "3.8.2",
  "os_name": "posix",
  "platform_machine": "x86_64",
  "platform_release": "19.4.0",
  "platform_system": "Darwin",
  "platform_version": "Darwin Kernel Version 19.4.0: Wed Mar  4 22:28:40 PST 2020; root:xnu-6153.101.6~15/RELEASE_X86_64",
  "python_full_version": "3.8.2",
  "platform_python_implementaiton": "CPython",
  "python_version": "3.8",
  "sys_platform": "darwin"
}