Manual: no longer claim Windows 7 support

Closes: #1759
(cherry picked from commit f33692c7)

doc/manual/source/installation-and-configuration.rst

@@ -7,7 +7,7 @@ Installation and configuration
 Software requirements
 =====================
 
-Packaged versions of Dynare are available for Windows (7, 8.1, 10 and 11),
+Packaged versions of Dynare are available for Windows (8.1, 10 and 11),
 several GNU/Linux distributions (Debian, Ubuntu, Linux Mint, Arch Linux) and
 macOS (11). Dynare should work on other systems, but some compilation steps are
 necessary in that case.