Add the `.direnv/` directory to .gitignore (#14707)

.gitignore

@@ -36,6 +36,7 @@ __pycache__/
 
 # For direnv users
 /.envrc
+.direnv/
 
 # IDEs
 /.idea/

changelog.d/14707.misc

@@ -0,0 +1 @@
+Add `.direnv/` directory to .gitignore to prevent local state generated by the [direnv](https://direnv.net/) development tool from being committed.