[3.13] gh-125398: Convert paths in venv activate script when using Git Bash under Windows (GH-125399) (GH-125733)

(cherry picked from commit 2a378db)

Author: miss-islington

Lib/venv/scripts/common/activate

@@ -38,8 +38,8 @@ deactivate nondestructive
 
 # on Windows, a path can contain colons and backslashes and has to be converted:
 case "$(uname)" in
-    CYGWIN*|MSYS*)
-        # transform D:\path\to\venv to /d/path/to/venv on MSYS
+    CYGWIN*|MSYS*|MINGW*)
+        # transform D:\path\to\venv to /d/path/to/venv on MSYS and MINGW
         # and to /cygdrive/d/path/to/venv on Cygwin
         VIRTUAL_ENV=$(cygpath "__VENV_DIR__")
         export VIRTUAL_ENV

Misc/NEWS.d/next/Library/2024-10-13-15-04-58.gh-issue-125398.UW7Ndv.rst

@@ -0,0 +1 @@
+Fix the conversion of the :envvar:`!VIRTUAL_ENV` path in the activate script in :mod:`venv` when running in Git Bash for Windows.