Fix broken pipe error building version file

(11:34:09) ERROR: /tmpfs/src/github/repo/runsc/BUILD:82:1: Couldn't build file runsc/version.txt: Executing genrule //runsc:deb-version failed (Broken pipe): bash failed: error executing command

PiperOrigin-RevId: 252691902

runsc/BUILD

@@ -82,7 +82,7 @@ pkg_tar(
 genrule(
     name = "deb-version",
     outs = ["version.txt"],
-    cmd = "$(location :runsc) -version | head -n 1 | sed 's/^[^0-9]*//' > $@",
+    cmd = "$(location :runsc) -version | grep 'runsc version' | sed 's/^[^0-9]*//' > $@",
     stamp = 1,
     tools = [":runsc"],
 )