MINOR: version: this is development again (3.2)

This basically reverts commit b629f366a7 ("MINOR: version: mention that
3.1 is stable now").

INSTALL

@@ -1,12 +1,13 @@
 Installation instructions for HAProxy
 =====================================
 
-HAProxy 3.1 is a stable version, which means that it will get fixes for bugs as
-they are discovered till around Q1 2026 and should not receive new features.
-This version is mostly suited at experienced users who are willing to quickly
-follow updates. New users are encouraged to use long term supported versions
-such as the ones provided by their software vendor or Linux distribution, as
-such versions require far less common updates.
+This is a development version, so it is expected to break from time to time,
+to add and remove features without prior notification and it should not be used
+in production, unless you're an experienced user and are willing to follow
+weekly updates. If you are not used to build from sources or if you are not
+used to follow updates then it is recommended that instead you use the packages
+provided by your software vendor or Linux distribution. Most of them are taking
+this task seriously and are doing a good job at backporting important fixes.
 
 If for any reason you would prefer a different version than the one packaged
 for your system, you want to be certain to have all the fixes or to get some

include/haproxy/version.h

@@ -39,7 +39,7 @@
 #ifdef  CONFIG_PRODUCT_STATUS
 #define PRODUCT_STATUS    CONFIG_PRODUCT_STATUS
 #else
-#define PRODUCT_STATUS   "Status: stable branch - will stop receiving fixes around Q1 2026."
+#define PRODUCT_STATUS   "Status: development branch - not safe for use in production."
 #endif
 
 #ifdef CONFIG_PRODUCT_URL_BUGS