[nats] Release v2.9.21 (#15148)

* [nats] Release v2.9.21

Details can be found [here](https://github.com/nats-io/nats-server/releases/tag/v2.9.21)

Signed-off-by: Byron Ruth <[email protected]>

library/nats

@@ -5,25 +5,25 @@ Maintainers: Derek Collison <[email protected]> (@derekcollison),
              Phil Pennock <[email protected]> (@philpennock)
 GitRepo: https://github.com/nats-io/nats-docker.git
 GitFetch: refs/heads/main
-GitCommit: 6ee3723373975f65c7b446e20d4a938a5c5a5567
+GitCommit: 36c73754f3d7b2b2e69a0c4680a48636929012cc
 
-Tags: 2.9.20-alpine3.18, 2.9-alpine3.18, 2-alpine3.18, alpine3.18, 2.9.20-alpine, 2.9-alpine, 2-alpine, alpine
+Tags: 2.9.21-alpine3.18, 2.9-alpine3.18, 2-alpine3.18, alpine3.18, 2.9.21-alpine, 2.9-alpine, 2-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-Directory: 2.9.20/alpine3.18
+Directory: 2.9.21/alpine3.18
 
-Tags: 2.9.20-scratch, 2.9-scratch, 2-scratch, scratch, 2.9.20-linux, 2.9-linux, 2-linux, linux
-SharedTags: 2.9.20, 2.9, 2, latest
+Tags: 2.9.21-scratch, 2.9-scratch, 2-scratch, scratch, 2.9.21-linux, 2.9-linux, 2-linux, linux
+SharedTags: 2.9.21, 2.9, 2, latest
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-Directory: 2.9.20/scratch
+Directory: 2.9.21/scratch
 
-Tags: 2.9.20-windowsservercore-1809, 2.9-windowsservercore-1809, 2-windowsservercore-1809, windowsservercore-1809
-SharedTags: 2.9.20-windowsservercore, 2.9-windowsservercore, 2-windowsservercore, windowsservercore
+Tags: 2.9.21-windowsservercore-1809, 2.9-windowsservercore-1809, 2-windowsservercore-1809, windowsservercore-1809
+SharedTags: 2.9.21-windowsservercore, 2.9-windowsservercore, 2-windowsservercore, windowsservercore
 Architectures: windows-amd64
-Directory: 2.9.20/windowsservercore-1809
+Directory: 2.9.21/windowsservercore-1809
 Constraints: windowsservercore-1809
 
-Tags: 2.9.20-nanoserver-1809, 2.9-nanoserver-1809, 2-nanoserver-1809, nanoserver-1809
-SharedTags: 2.9.20-nanoserver, 2.9-nanoserver, 2-nanoserver, nanoserver, 2.9.20, 2.9, 2, latest
+Tags: 2.9.21-nanoserver-1809, 2.9-nanoserver-1809, 2-nanoserver-1809, nanoserver-1809
+SharedTags: 2.9.21-nanoserver, 2.9-nanoserver, 2-nanoserver, nanoserver, 2.9.21, 2.9, 2, latest
 Architectures: windows-amd64
-Directory: 2.9.20/nanoserver-1809
+Directory: 2.9.21/nanoserver-1809
 Constraints: nanoserver-1809, windowsservercore-1809