[Git] Ignore python/requirements directory (#13684)

This directory is automatically generated by the
`python/gen_requirements.py` script, and should be ignored by git
whenever present.

Author: Lunderberg

.gitignore

@@ -32,6 +32,9 @@ var/
 *.manifest
 *.spec
 
+# Generated by python/gen_requirements.py
+python/requirements/*.txt
+
 # Installer logs
 pip-log.txt
 pip-delete-this-directory.txt