psutil: add snicstats.flags (#8928)

Fixes #8927 

See https://github.com/giampaolo/psutil/commit/70eecaf44d61f2cabcd22ffb407b904242a122c9

stubs/psutil/psutil/_common.pyi

@@ -131,6 +131,7 @@ class snicstats(NamedTuple):
     duplex: int
     speed: int
     mtu: int
+    flags: str
 
 class scpustats(NamedTuple):
     ctx_switches: int