Resolve drive on windows releases (#13825)

Author: mccricri

lib/mix/lib/mix/tasks/release.init.ex

@@ -301,9 +301,10 @@ defmodule Mix.Tasks.Release.Init do
     setlocal enabledelayedexpansion
 
     pushd .
-    cd "%~dp0\.."
+    pushd "%~dp0\.."
     set RELEASE_ROOT=%cd%
     popd
+    popd
 
     if not defined RELEASE_NAME (set RELEASE_NAME=<%= @release.name %>)
     if not defined RELEASE_VSN (for /f "tokens=1,2" %%K in ('type "!RELEASE_ROOT!\releases\start_erl.data"') do (set ERTS_VSN=%%K) && (set RELEASE_VSN=%%L))