sngrep: upgrade 1.8.0 -> 1.8.1

Changelog:
 capture: fix possible buffer overflow while processing headers

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-networking/recipes-support/sngrep/sngrep_1.8.1.bb

@@ -16,7 +16,7 @@ DEPENDS = "\
 "
 
 SRC_URI = "git://github.com/irontec/sngrep.git;protocol=https;branch=master"
-SRCREV = "f7b36df3b79617892958b67cb4ad9313c6ce72d2"
+SRCREV = "373abb90804ba71f980c7120e62f90d3a5c81213"
 
 S = "${WORKDIR}/git"