make: fix govet target after renaming hubble-proxy to hubble-relay

hubble-proxy was renamed to hubble-relay in #11122, adjust its name in
the `govet` list as well.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

Makefile

@@ -375,7 +375,7 @@ govet:
     ./cilium-health/... \
     ./common/... \
     ./daemon/... \
-    ./hubble-proxy/... \
+    ./hubble-relay/... \
     ./operator/... \
     ./pkg/... \
     ./plugins/... \