Merge pull request matplotlib#27374 from StefRe/mnt/gitignore

MNT: add _version.py to .gitignore

Author: rcomer

.gitignore

@@ -44,6 +44,8 @@ pip-wheel-metadata/*
 # build subproject files
 subprojects/*/
 !subprojects/packagefiles/
+# file generated by setuptools_scm
+_version.py
 
 # OS generated files #
 ######################