py(vcspull[init]): Drop the vestigial shebang

why: src/vcspull/__init__.py carried `#!/usr/bin/env python` but is a
package initializer, never run as a script, and is not executable. The
shebang promises something the file cannot do.

what:
- Remove the shebang line from the package initializer

https://docs.astral.sh/ruff/rules/shebang-not-executable/

Author: tony

src/vcspull/__init__.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 """Manage multiple git, mercurial, svn repositories from a YAML / JSON file.
 
 :copyright: Copyright 2013-2018 Tony Narlock.