ci: drop some EOLed 2.x Tarantool

Versions 2.2--2.7 have reached their end of life in 2020-2021 [1].

1. https://www.tarantool.io/ru/doc/latest/release/eol_versions/

.github/workflows/test_on_push.yaml

@@ -17,7 +17,7 @@ jobs:
         # it uses its own metrics package.
         # We test old metrics with Cartridge 2.7.9 because since 2.8.0 it
         # requires metrics 1.0.0.
-        tarantool-version: ["1.10.6", "1.10", "2.2", "2.3", "2.4", "2.5", "2.6", "2.7", "2.8", "2.10", "2.11"]
+        tarantool-version: ["1.10.6", "1.10", "2.8", "2.10", "2.11"]
         metrics-version: [""]
         cartridge-version: ["2.8.0"]
         external-tuple-merger-version: [""]