chore: remove support for GKE 1.20

ref: https://cloud.google.com/kubernetes-engine/docs/release-notes-nochannel#October_05_2022

CHANGELOG.md

@@ -10,13 +10,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 - chore: upgrade nginx to 1.23.1 [#2544] [#2554]
+- chore: remove support for GKE 1.20 [#2578]
 
 ### Fixed
 
 - fix(openshift): fix remote write proxy - use unprivileged NGINX [#2510][#2510]
 
 [#2510]: https://github.com/SumoLogic/sumologic-kubernetes-collection/pull/2510
 [#2544]: https://github.com/SumoLogic/sumologic-kubernetes-collection/pull/2544
+[#2578]: https://github.com/SumoLogic/sumologic-kubernetes-collection/pull/2578
 [Unreleased]: https://github.com/SumoLogic/sumologic-kubernetes-collection/compare/v2.17.0...main
 
 ## [v2.17.0]

deploy/README.md

@@ -80,7 +80,7 @@ The following table displays the tested Kubernetes and Helm versions.
 |---------------|------------------------------------------|
 | K8s with EKS  | 1.19<br/>1.20<br/>1.21<br/>1.22<br/>1.23 |
 | K8s with Kops | 1.20<br/>1.21<br/>1.22<br/>1.23<br/>1.24 |
-| K8s with GKE  | 1.20<br/>1.21<br/>1.22<br/>1.23          |
+| K8s with GKE  | 1.21<br/>1.22<br/>1.23                   |
 | K8s with AKS  | 1.22<br/>1.23<br/>1.24                   |
 | OpenShift     | 4.6<br/>4.7<br/>4.8<br/>4.9<br/>4.10     |
 | Helm          | 3.8.2 (Linux)                            |