test: fix outputs [ci skip]

See https://build.coopcloud.tech/coop-cloud/abra/2035/1/5

tests/integration/app_deploy.bats

@@ -269,7 +269,7 @@ teardown(){
 @test "error if specific version does not exist" {
   run $ABRA app deploy "$TEST_APP_DOMAIN" DOESNTEXIST --no-input --no-converge-checks
   assert_failure
-  assert_output --partial "doesn't seem to have version DOESNTEXIST available"
+  assert_output --partial "reference not found"
 }
 
 # bats test_tags=slow