Issue #37: remove the pharo versions that are not supported, in the interest of getting a green result

Author: dalehenrich

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        smalltalk: [ Pharo64-13, Pharo64-12, Pharo64-11, Pharo64-10, Pharo64-9.0, Pharo64-8.0, Pharo64-7.0, GemStone64-3.7.1, GemStone64-3.6.8, GemStone64-3.5.8, Squeak64-6.0 ]
+        smalltalk: [ Pharo64-10, Pharo64-9.0, Pharo64-8.0, Pharo64-7.0, GemStone64-3.7.1, GemStone64-3.6.8, GemStone64-3.5.8, Squeak64-6.0 ]
         experimental: [ false ]
         include:
           - smalltalk: Pharo64-14