Update golang toolchain to 1.23.9 (#31062)

* Update golang toolchain

* remove comment

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/go.mod

@@ -2,9 +2,7 @@ module github.com/mattermost/mattermost/server/v8
 
 go 1.23.0
 
-toolchain go1.23.7
-
-//replace github.com/mattermost/mattermost/server/public => /Users/ibrahim/go/src/github.com/mattermost/mattermost-server/server/public
+toolchain go1.23.9
 
 require (
 	code.sajari.com/docconv/v2 v2.0.0-pre.4