Update reflect2 to 1.0.1 (memory utilization fix)

Picking up https://github.com/modern-go/reflect2/pull/2 which lazy
initializes a map of all types which we don't use in k8s, saving
memory & initialization time.

vendor/github.com/modern-go/reflect2/reflect2.go

@@ -150,6 +150,9 @@ func (cfg *frozenConfig) TypeOf(obj interface{}) Type {
 }
 
 func (cfg *frozenConfig) Type2(type1 reflect.Type) Type {
+	if type1 == nil {
+		return nil
+	}
 	cacheKey := uintptr(unpackEFace(type1).data)
 	typeObj, found := cfg.cache.Load(cacheKey)
 	if found {