CODEOWNERS: add sig-hubble to review datapath trace changes

cilium#30154 and
cilium#31073 introduced new datapath
trace reasons and had an impact on Hubble, but the sig-hubble team
doesn't get automatically pulled in for review.

This patch adds the sig-hubble team to review datapath_trace.go changes.

Signed-off-by: Alexandre Perrin <alex@isovalent.com>

CODEOWNERS

@@ -494,6 +494,7 @@ Makefile* @cilium/build
 /pkg/metrics @cilium/metrics
 /pkg/monitor @cilium/sig-datapath
 /pkg/monitor/api @cilium/api @cilium/sig-datapath
+/pkg/monitor/datapath_trace.go @cilium/sig-datapath @cilium/sig-hubble
 /pkg/monitor/format @cilium/cli @cilium/sig-datapath
 /pkg/monitor/payload @cilium/api @cilium/sig-datapath
 /pkg/mountinfo @cilium/sig-datapath