Bump desired pip version to 23

Author: MatthijsBurgh

installer/tue-install-impl.bash

@@ -1110,7 +1110,7 @@ function _tue-install-pip-now
     # Make sure pip is up-to-date before checking version and installing
     local pip_version desired_pip_version
     pip_version=$(python"${pv}" -m pip --version | awk '{print $2}')
-    desired_pip_version="22"
+    desired_pip_version="23"
     if version_gt "$desired_pip_version" "$pip_version"
     then
         tue-install-debug "pip${pv} not yet version >=$desired_pip_version, but $pip_version"