[gtk-osx] Update pypa get-pip URI.

[John Ralls <jralls src gnome org>]

commit a5c1dcaad90518ac04684d39bcddb588f7b2c597
Author: John Ralls <jralls ceridwen us>
Date:   Tue Apr 13 12:23:46 2021 -0700

    Update pypa get-pip URI.
    
    Fixes https://gitlab.gnome.org/GNOME/gtk-osx/-/issues/36

 gtk-osx-setup.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk-osx-setup.sh b/gtk-osx-setup.sh
index 55ccb998..115f65e6 100755
--- a/gtk-osx-setup.sh
+++ b/gtk-osx-setup.sh
@@ -100,7 +100,7 @@ PIP=`which pip`
 if test ! -x "`eval echo $PIP`" ; then
     mv=`python --version 2>&1 | cut -b 12-13`
     if test $mv -lt 11 ; then
-        curl https://bootstrap.pypa.io/2.7/get-pip.py -o "$DEVPREFIX/get-pip.py"
+        curl https://bootstrap.pypa.io/pip/2.7/get-pip.py -o "$DEVPREFIX/get-pip.py"
         python "$DEVPREFIX/get-pip.py" --user
         rm "$DEVPREFIX/get-pip.py"
     else