BATS: k8s/spinkube-npm: Fix expected text

The spin-js-sdk template was updated at some point to print different text
which caused tests to fail.  Update the expression to match both the old
and new outputs (and hopefully whatever else they change it to).

Old text: "Hello from JS-SDK"
Intermediate text: "Hello, Universe!"
New text: "hello universe"

Signed-off-by: Mark Yen <mark.yen@suse.com>

bats/tests/k8s/spinkube-npm.bats

@@ -87,5 +87,5 @@ EOF
 
     run --separate-stderr try curl --connect-timeout 5 --fail "http://${host}"
     assert_success
-    assert_output "Hello from JS-SDK"
+    assert_output --regexp '^(Hello|hello)'
 }