Update redhat-openshift.md (#2442)

Update redhat-openshift support version page to indicate 4.10 will not be supported anymore with the next release (8.3).

My understanding is that this will just affect the docs under the `next` flag. Please let me know if I need to do anything more :) 

(my historic first every doc PR 🥳 )

docs/self-managed/platform-deployment/helm-kubernetes/platforms/redhat-openshift.md

@@ -12,7 +12,6 @@ We test against the following OpenShift versions and guarantee compatibility wit
 
 | OpenShift version | Supported |
 | ----------------- | ------------------ |
-| 4.10.x | :white_check_mark: |
 | 4.11.x | :white_check_mark: |
 | 4.12.x | :white_check_mark: |
 | 4.13.x | :white_check_mark: |