poky: Update version to 2.3.4

(From meta-yocto rev: 17b7a75b22b2ca1a19d0a8656c0183b738932189)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-poky/conf/distro/poky.conf

@@ -1,6 +1,6 @@
 DISTRO = "poky"
 DISTRO_NAME = "Poky (Yocto Project Reference Distro)"
-DISTRO_VERSION = "2.3.3"
+DISTRO_VERSION = "2.3.4"
 DISTRO_CODENAME = "pyro"
 SDK_VENDOR = "-pokysdk"
 SDK_VERSION := "${@'${DISTRO_VERSION}'.replace('snapshot-${DATE}','snapshot')}"