tmux: bump version to 2.3

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/tmux/tmux.hash

@@ -1,2 +1,2 @@
 # Locally computed:
-sha256  bc28541b64f99929fe8e3ae7a02291263f3c97730781201824c0f05d7c8e19e4  tmux-2.2.tar.gz
+sha256 55313e132f0f42de7e020bf6323a1939ee02ab79c48634aa07475db41573852b  tmux-2.3.tar.gz

package/tmux/tmux.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-TMUX_VERSION = 2.2
+TMUX_VERSION = 2.3
 TMUX_SITE = https://github.com/tmux/tmux/releases/download/$(TMUX_VERSION)
 TMUX_LICENSE = ISC
 TMUX_LICENSE_FILES = README