CHANGELOG: update to include experimental-apply-warning-duration

[hexfusion]

Signed-off-by: Sam Batschelet [email protected]

Please read https://github.com/etcd-io/etcd/blob/master/CONTRIBUTING.md#contribution-flow.

depends on #12740

[codecov-io]

Codecov Report

Merging #12741 (e9947bc) into master (102c198) will decrease coverage by 4.75%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12741      +/-   ##
==========================================
- Coverage   71.29%   66.53%   -4.76%     
==========================================
  Files         422      419       -3     
  Lines       33038    32950      -88     
==========================================
- Hits        23553    21924    -1629     
- Misses       7550     8945    +1395     
- Partials     1935     2081     +146     

Flag	Coverage Δ
all	66.53% <ø> (-4.76%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/testutil/recorder.go	0.00% <0.00%> (-80.96%)	⬇️
server/etcdserver/api/v3compactor/revision.go	0.00% <0.00%> (-76.93%)	⬇️
server/auth/options.go	32.43% <0.00%> (-59.46%)	⬇️
server/proxy/tcpproxy/userspace.go	0.00% <0.00%> (-53.85%)	⬇️
server/wal/repair.go	0.00% <0.00%> (-52.84%)	⬇️
client/v2/cluster_error.go	50.00% <0.00%> (-50.00%)	⬇️
server/wal/walpb/record.go	50.00% <0.00%> (-50.00%)	⬇️
server/etcdserver/api/v2store/event_queue.go	50.00% <0.00%> (-50.00%)	⬇️
server/etcdserver/api/v3compactor/periodic.go	39.43% <0.00%> (-49.30%)	⬇️
server/wal/decoder.go	48.64% <0.00%> (-41.90%)	⬇️
... and 126 more

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[spzala]

lgtm, we missed it adding in 3.5 changelog earlier, glad you covered it :)
Thanks @hexfusion

[hexfusion]

test fail unrelated.