Copy release notes from release-20.0 into main

This commit was made automatically by the vitess-releaser tool.

See https://github.com/vitessio/vitess-releaser

Signed-off-by: Rohit Nayak <[email protected]>

changelog/20.0/20.0.4/changelog.md

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+# Changelog of Vitess v20.0.4
+
+### Bug fixes 
+#### Query Serving
+ * [release-20.0] Use proper keyspace when updating the query graph of a reference DML (#17226) [#17257](https://github.com/vitessio/vitess/pull/17257) 
+#### Topology
+ * [release-20.0] Close zookeeper topo connection on disconnect (#17136) [#17192](https://github.com/vitessio/vitess/pull/17192) 
+#### VTTablet
+ * [release-20.0] Fix deadlock in messager and health streamer (#17230) [#17234](https://github.com/vitessio/vitess/pull/17234)
+ * [release-20.0] Fix potential deadlock in health streamer (#17261) [#17269](https://github.com/vitessio/vitess/pull/17269)
+### CI/Build 
+#### Build/CI
+ * [release-20.0] Specify Ubuntu 24.04 for all jobs (#17278) [#17281](https://github.com/vitessio/vitess/pull/17281) 
+#### Cluster management
+ * [release-20.0] Fix flakiness in `TestListenerShutdown` (#17024) [#17188](https://github.com/vitessio/vitess/pull/17188) 
+#### General
+ * [release-20.0] Upgrade the Golang version to `go1.22.9` [#17212](https://github.com/vitessio/vitess/pull/17212)
+### Enhancement 
+#### Query Serving
+ * [release-20.0] Fix to prevent stopping buffering prematurely (#17013) [#17204](https://github.com/vitessio/vitess/pull/17204)
+### Internal Cleanup 
+#### Build/CI
+ * [release-20.0] Change the name of the vitess-tester repository (#16917) [#17029](https://github.com/vitessio/vitess/pull/17029)
+### Testing 
+#### Build/CI
+ * [release-20.0] Flakes: Address flakiness in TestZkConnClosedOnDisconnect (#17194) [#17196](https://github.com/vitessio/vitess/pull/17196)
+

changelog/20.0/20.0.4/release_notes.md

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+# Release of Vitess v20.0.4
+The entire changelog for this release can be found [here](https://github.com/vitessio/vitess/blob/main/changelog/20.0/20.0.4/changelog.md).
+
+The release includes 10 merged Pull Requests.
+
+Thanks to all our contributors: @app/vitess-bot, @frouioui
+

changelog/20.0/README.md

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 ## v20.0
+* **[20.0.4](20.0.4)**
+	* [Changelog](20.0.4/changelog.md)
+	* [Release Notes](20.0.4/release_notes.md)
+
 * **[20.0.3](20.0.3)**
 	* [Changelog](20.0.3/changelog.md)
 	* [Release Notes](20.0.3/release_notes.md)