Switch paramiko.sh to be fully uv-based (#13240)

* Switch paramiko.sh to be fully uv-based

This is ~= what I do in local dev after the 4.0 update. I have some local idiosyncracies re: where UV sticks its venv, and whether the venv has pip in it (I create the venvs via `uv venv --seed`), _but_ I don't believe either of those matter for this environment/use case.

* Add inexact, active flags to uv sync

inexact = don't blow away stuff already in the venv (being managed outside this script), active = also, kinda use that venv plz, there's some confusion re: whether it's actually hitting the same path as exterior env.

Author: bitprophet

.github/downstream.d/paramiko.sh

@@ -5,9 +5,8 @@ case "${1}" in
         git clone --depth=1 https://github.com/paramiko/paramiko
         cd paramiko
         git rev-parse HEAD
-        uv pip install pip
-        uv pip install -e . --group dev
-        pip install . --group dev
+        uv --version
+        uv sync --inexact --active
         ;;
     run)
         cd paramiko