Only test supported versions 1.21-1.23

Author: williammartin

.github/workflows/ci.yml

@@ -5,10 +5,10 @@ jobs:
   test:
     strategy:
       matrix:
-        go: [ '1.13', '1.15', '1.16', '1.17', '1.18', '1.19' ]
+        go: [ '1.21', '1.22', '1.23' ]
         os: [ ubuntu-latest, macos-latest, windows-latest ]
       fail-fast: false
-    
+
     name: Test suite
     runs-on: ${{ matrix.os }}