vendor: update gRPC Go to v1.26.0

[YoyinZyc]

for #11519

[codecov-io]

Codecov Report

Merging #11522 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #11522      +/-   ##
==========================================
+ Coverage   64.39%   64.44%   +0.05%     
==========================================
  Files         403      403              
  Lines       38088    38088              
==========================================
+ Hits        24525    24547      +22     
+ Misses      11924    11901      -23     
- Partials     1639     1640       +1

Impacted Files	Coverage Δ
clientv3/namespace/watch.go	87.87% <0%> (-6.07%)	⬇️
etcdserver/api/v3rpc/lease.go	69.31% <0%> (-5.69%)	⬇️
clientv3/concurrency/mutex.go	62.16% <0%> (-5.41%)	⬇️
etcdserver/api/v3rpc/watch.go	78.43% <0%> (-2.29%)	⬇️
mvcc/watchable_store.go	83.21% <0%> (-2.1%)	⬇️
etcdserver/api/rafthttp/peer.go	77.65% <0%> (-1.12%)	⬇️
etcdserver/cluster_util.go	56.52% <0%> (-0.8%)	⬇️
clientv3/leasing/kv.go	89.7% <0%> (-0.67%)	⬇️
etcdserver/server.go	66.81% <0%> (-0.07%)	⬇️
clientv3/watch.go	89.77% <0%> (ø)	⬆️
... and 9 more

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[xiang90]

lgtm

[jpbetz]

lgtm

[xiang90]

@YoyinZyc change log needs to be updated.

[spzala]

@YoyinZyc hi, I was looking at the couple of issue #11532 and #11529
and I think that these issues are might be because of https://github.com/etcd-io/etcd/tree/master/vendor/google.golang.org/grpc/internal doesn't have the referenced internal/buffer package. The https://github.com/grpc/grpc-go/tree/master/internal has it there. I haven't worked on updating etcd vendor files before but I believe having vendor dir updated with grpc-go master buffer should fix it. Please let me know what you think? Thanks!

[spzala]

@YoyinZyc similar to my above comment - while looking at the couple of issues #11532 and #11529
, I think that these issues are might be because of https://github.com/etcd-io/etcd/tree/master/vendor/google.golang.org/grpc/internal doesn't have the referenced internal/resolver package. The https://github.com/grpc/grpc-go/tree/master/internal has it there. I haven't worked on updating etcd vendor files before but I believe having vendor dir updated with these packages should fix it. Please let me know what you think? Thanks!