Update list of supported ruby versions

* Add latest patch versions
* Drop versions that are EOL-ed

Author: Tomas Volf

ruby/private/sdk.bzl

@@ -8,26 +8,21 @@ def rules_ruby_select_sdk(version = "host"):
 
     supported_versions = [
         "host",
-        "2.5.8",
-        "2.5.9",
-        "2.6.3",
-        "2.6.4",
-        "2.6.5",
-        "2.6.6",
-        "2.6.7",
-        "2.6.8",
-        "2.6.9",
+        "2.7.0",
         "2.7.1",
         "2.7.2",
         "2.7.3",
         "2.7.4",
         "2.7.5",
+        "2.7.6",
         "3.0.0",
         "3.0.1",
         "3.0.2",
         "3.0.3",
+        "3.0.4",
         "3.1.0",
         "3.1.1",
+        "3.1.2",
     ]
 
     if version in supported_versions: