FindPython: Replace link to PyPy with its http redirect

Modules/FindPython.cmake

@@ -445,7 +445,7 @@ Hints
     See `IronPython <https://ironpython.net>`_.
   * ``PyPy``: This implementation use ``RPython`` language and
     ``RPython translation toolchain`` to produce the python interpreter.
-    See `PyPy <https://www.pypy.org>`_.
+    See `PyPy <https://pypy.org>`_.
 
   The default value is:
 

Modules/FindPython2.cmake

@@ -339,7 +339,7 @@ Hints
     See `IronPython <https://ironpython.net>`_.
   * ``PyPy``: This implementation use ``RPython`` language and
     ``RPython translation toolchain`` to produce the python interpreter.
-    See `PyPy <https://www.pypy.org>`_.
+    See `PyPy <https://pypy.org>`_.
 
   The default value is:
 

Modules/FindPython3.cmake

@@ -443,7 +443,7 @@ Hints
     See `IronPython <https://ironpython.net>`_.
   * ``PyPy``: This implementation use ``RPython`` language and
     ``RPython translation toolchain`` to produce the python interpreter.
-    See `PyPy <https://www.pypy.org>`_.
+    See `PyPy <https://pypy.org>`_.
 
   The default value is: