VOL-2265 test go.mod and vendor consistency;
Update dependencies to resolve `410 Gone` errors when fetching modules

Change-Id: If0bdbc1b6d629ce819b9fa4701c016df812f92d5
diff --git a/vendor/github.com/jhump/protoreflect/desc/descriptor_no_unsafe.go b/vendor/github.com/jhump/protoreflect/desc/descriptor_no_unsafe.go
index d8e2df0..cd7348e 100644
--- a/vendor/github.com/jhump/protoreflect/desc/descriptor_no_unsafe.go
+++ b/vendor/github.com/jhump/protoreflect/desc/descriptor_no_unsafe.go
@@ -1,5 +1,6 @@
-//+build appengine
-// TODO: other build tags for environments where unsafe package is inappropriate
+//+build appengine gopherjs purego
+// NB: other environments where unsafe is unappropriate should use "purego" build tag
+// https://github.com/golang/go/issues/23172
 
 package desc