upgrade to nginx 1.21.1

[dgrove-oss]

No description provided.

[codecov-commenter]

Codecov Report

Merging #5152 (64203a5) into master (3e6138d) will increase coverage by 31.03%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #5152       +/-   ##
===========================================
+ Coverage   43.71%   74.75%   +31.03%     
===========================================
  Files         231      231               
  Lines       12803    12803               
  Branches      501      501               
===========================================
+ Hits         5597     9571     +3974     
+ Misses       7206     3232     -3974     

Impacted Files	Coverage Δ
...whisk/connector/kafka/KafkaProducerConnector.scala	60.00% <0.00%> (-27.50%)	⬇️
...pache/openwhisk/core/invoker/InvokerReactive.scala	58.62% <0.00%> (-19.83%)	⬇️
...nwhisk/core/scheduler/queue/ContainerCounter.scala	84.21% <0.00%> (-7.90%)	⬇️
...ntainerpool/v2/FunctionPullingContainerProxy.scala	78.12% <0.00%> (+0.34%)	⬆️
...pache/openwhisk/core/containerpool/Container.scala	90.80% <0.00%> (+1.14%)	⬆️
.../org/apache/openwhisk/core/entity/EntityPath.scala	100.00% <0.00%> (+1.88%)	⬆️
...la/org/apache/openwhisk/common/TransactionId.scala	94.38% <0.00%> (+2.24%)	⬆️
.../org/apache/openwhisk/http/PoolingRestClient.scala	90.90% <0.00%> (+3.03%)	⬆️
...sk/core/containerpool/docker/DockerContainer.scala	95.60% <0.00%> (+3.29%)	⬆️
...in/scala/org/apache/openwhisk/common/Logging.scala	77.07% <0.00%> (+3.90%)	⬆️
... and 127 more

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