Update self.min_version to 13.0 in torbrowser_launcher/launcher.py

We should do this change:

diff --git a/torbrowser_launcher/launcher.py b/torbrowser_launcher/launcher.py
index 1c18280..e04e68d 100644
--- a/torbrowser_launcher/launcher.py
+++ b/torbrowser_launcher/launcher.py
@@ -72,7 +72,7 @@ class Launcher(QtWidgets.QMainWindow):
         self.force_redownload = False

         # This is the current version of Tor Browser, which should get updated with every release
-        self.min_version = "12.0"
+        self.min_version = "13.0"

         # Init launcher
         self.set_state(None, "", [])