(gitconfig) Add push.autoSetupRemote setting

More details on this new feature in git 2.37.0: https://medium.com/@anjusha.khandavalli/auto-setup-remote-branch-with-push-autosetupremote-892ddd7644

gitconfig

@@ -84,10 +84,14 @@
     # normally pull from (i.e. central workflow).
     default = upstream
 
+    # Automatically sets -u on default push when no upstream tracking exists for
+    # the current branch.
+    autoSetupRemote = true
+
 [rebase]
     # Enable the --autosquash flag by default, which is useful for automatically
     # applying fixup commits to previous commits.
-    autosquash = true
+    autoSquash = true
 
 [filter "media"]
     clean = git-media-clean %f