Download enchant dict from downloads.php.net

Since windows.php.net is in the progress to be migrated to
downloads.php.net anyway, we may as well fetch the dictionary from the
new site right away.

Closes GH-16310.

Author: cmb69

.github/scripts/windows/test_task.bat

@@ -103,7 +103,7 @@ mkdir %~d0\usr\local\share\enchant\hunspell
 if %errorlevel% neq 0 exit /b 3
 echo Fetching enchant dicts
 pushd %~d0\usr\local\share\enchant\hunspell
-powershell -Command wget http://windows.php.net/downloads/qa/appveyor/ext/enchant/dict.zip -OutFile dict.zip
+powershell -Command wget https://downloads.php.net/~windows/qa/appveyor/ext/enchant/dict.zip -OutFile dict.zip
 unzip dict.zip
 del /q dict.zip
 popd