FIX: Use Py2-compatible version file template for fmriprep-docker (#3101)

CI checks for installing the wrapper in Python 2.7 are failing. This is
due to `setuptools_scm` adding type annotations to the `_version.py`
files.

Note that you can't `pip install ./wrapper` anymore, but that's been
true since we started using type-annotated build tools. As long as they
don't inject type annotations, we can still build wheels that will
install in Python 2.

Author: effigies

wrapper/pyproject.toml

@@ -49,6 +49,12 @@ raw-options = { version_scheme = "nipreps-calver", root = ".." }
 
 [tool.hatch.build.hooks.vcs]
 version-file = "src/fmriprep_docker/_version.py"
+template = """\
+# file generated by setuptools_scm
+# don't change, don't track in version control
+__version__ = version = {version!r}
+__version_tuple__ = version_tuple = {version_tuple!r}
+"""
 
 [tool.distutils.bdist_wheel]
 universal = true