Upgrade to Octave 4.4.1 for Windows installer

(cherry picked from commit d3c618e8)

windows/README.txt

@@ -57,7 +57,7 @@ Using Dynare with Octave
 Dynare also works on top of GNU Octave, a free clone of MATLAB (R) (see
 <http://www.octave.org>).
 
-This version of Dynare is compiled for Octave 4.4.0 (MinGW, 32bit and 64bit), and may not work
+This version of Dynare is compiled for Octave 4.4.1 (MinGW, 32bit and 64bit), and may not work
 with other versions of Octave. The recommended version of Octave can be
 downloaded at:
 

windows/dynare.nsi

@@ -112,12 +112,12 @@ SectionGroupEnd
 
 SectionGroup "MEX files for Octave"
 
-Section "MEX files for Octave 4.4.0 (MinGW, 64bit)"
+Section "MEX files for Octave 4.4.1 (MinGW, 64bit)"
  SetOutPath $INSTDIR\mex\octave
  File ..\mex\octave\*.mex ..\mex\octave\*.oct
 SectionEnd
 
-Section "MEX files for Octave 4.4.0 (MinGW, 32bit)"
+Section "MEX files for Octave 4.4.1 (MinGW, 32bit)"
  SetOutPath $INSTDIR\mex\octave32
  File ..\mex\octave32\*.mex ..\mex\octave32\*.oct
 SectionEnd