Drop maistra 2.3 from CI

[nak3]

As per title, this patch drops maistra 2.3 from CI.

2.4 was released and downstream also started testing with 2.4.

/kind cleanup

NONE

Docs

NONE

/cc @ReToCode @norbjd

[codecov]

Codecov Report

Merging #1091 (660d704) into main (f9d534e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1091   +/-   ##
=======================================
  Coverage   80.00%   80.00%           
=======================================
  Files          18       18           
  Lines        1430     1430           
=======================================
  Hits         1144     1144           
  Misses        229      229           
  Partials       57       57           

[nak3]

2.4 was released and downstream also started testing with 2.4.

Not only for testing but also the the official image on 1.30.0 RC1 is also using 2.4.1.

$ skopeo inspect docker://registry.redhat.io/openshift-service-mesh/proxyv2-rhel8@sha256:a10e76aa15707e708f82c8d9e8b5179bf67780d99f3c3e2e99b84ae2a0aa4ecb |grep 2.4.1-3
        "2.4.1-3",
        "2.4.1-3-source",
        "url": "https://access.redhat.com/containers/#/registry.access.redhat.com/openshift-service-mesh/proxyv2-rhel8/images/2.4.1-3",

[ReToCode]

/lgtm
/approve

[knative-prow]

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