[main] Copy v20.0.6 release notes (#17767)

Signed-off-by: Rohit Nayak <rohit@planetscale.com>
Co-authored-by: Rohit Nayak <rohit@planetscale.com>

changelog/20.0/20.0.6/changelog.md

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+# Changelog of Vitess v20.0.6
+
+### Bug fixes 
+#### Backup and Restore
+ * [release-20.0] Replace uses of os.Create with os2.Create within backup/restore workflows (#17648) [#17665](https://github.com/vitessio/vitess/pull/17665) 
+#### Query Serving
+ * [release-20.0] Fix panic inside schema tracker (#17659) [#17672](https://github.com/vitessio/vitess/pull/17672)
+ * [release-20.0] smartconnpool: do not allow connections to starve (#17675) [#17684](https://github.com/vitessio/vitess/pull/17684) 
+#### VReplication
+ * [release-20.0] VReplication: Address SwitchTraffic bugs around replication lag and cancel on error (#17616) [#17643](https://github.com/vitessio/vitess/pull/17643)
+ * [release-20.0] VDiff: fix race when a vdiff resumes on vttablet restart (#17638) [#17693](https://github.com/vitessio/vitess/pull/17693)
+ * [release-20.0] Atomic Copy: Fix panics when the copy phase starts in some clusters (#17717) [#17747](https://github.com/vitessio/vitess/pull/17747) 
+#### VTAdmin
+ * [release-20.0] fix SchemaCacheConfig.DefaultExpiration (#17609) [#17611](https://github.com/vitessio/vitess/pull/17611) 
+#### VTGate
+ * [release-20.0] Increase health check buffer size (#17636) [#17640](https://github.com/vitessio/vitess/pull/17640)
+### Dependencies 
+#### Java
+ * [release-20.0] Bump io.netty:netty-handler from 4.1.110.Final to 4.1.118.Final in /java (#17730) [#17732](https://github.com/vitessio/vitess/pull/17732)
+### Enhancement 
+#### VTAdmin
+ * [release-20.0] VTAdmin: update logo and favicon for the new Vitess logos (#17715) [#17724](https://github.com/vitessio/vitess/pull/17724)
+### Internal Cleanup 
+#### VReplication
+ * [release-20.0] Always make sure to escape all strings (#17649) [#17656](https://github.com/vitessio/vitess/pull/17656)
+### Release 
+#### General
+ * [release-20.0] Bump to `v20.0.6-SNAPSHOT` after the `v20.0.5` release [#17598](https://github.com/vitessio/vitess/pull/17598)
+

changelog/20.0/20.0.6/release_notes.md

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+# Release of Vitess v20.0.6
+The entire changelog for this release can be found [here](https://github.com/vitessio/vitess/blob/main/changelog/20.0/20.0.6/changelog.md).
+
+The release includes 12 merged Pull Requests.
+
+Thanks to all our contributors: @app/vitess-bot, @vitess-bot
+

changelog/20.0/README.md

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 ## v20.0
+* **[20.0.6](20.0.6)**
+	* [Changelog](20.0.6/changelog.md)
+	* [Release Notes](20.0.6/release_notes.md)
+
 * **[20.0.5](20.0.5)**
 	* [Changelog](20.0.5/changelog.md)
 	* [Release Notes](20.0.5/release_notes.md)