MINOR: version: mention that it's development again

This essentially reverts d705b85a4a43e9be5c99796e2b83197b42d6918e.
diff --git a/INSTALL b/INSTALL
index 1a90311..400513d 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,12 +1,13 @@
 Installation instructions for HAProxy
 =====================================
 
-HAProxy 2.7 is a stable version, which means that it will get fixes for bugs as
-they are discovered till around Q1 2024 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'd prefer to use a different version than the one packaged
 for your system, you want to be certain to have all the fixes or to get some