One more ref to 3.13 in installation instructions

Author: hjwp

pre-requisite-installations.asciidoc

@@ -197,7 +197,7 @@ But in brief, if Python 3.14 isn't available directly from your package manager,
 
 * On Ubuntu, you can install the
   https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa[deadsnakes PPA].
-  Make sure you `apt install python3.14-venv` as well as just `python3.13` to
+  Make sure you `apt install python3.14-venv` as well as just `python3.14` to
   un-break the default Debian version of Python.
 
 * Alternatively, https://docs.astral.sh/uv/guides/install-python[uv]