Use modern go in tests

Signed-off-by: R.I.Pienaar <rip@devco.net>

Author: ripienaar

.github/workflows/test.yaml

@@ -5,7 +5,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go: [ "1.20", "1.21" ]
+        go: [ "1.23", "1.24" ]
 
     env:
       GOPATH: /home/runner/work/terraform-provider-jetstream