Swap unpkg for esm to fix failing tests

Author: shawncrawley

docs/source/guides/escape-hatches/_examples/super_simple_chart/super-simple-chart.js

@@ -1,5 +1,5 @@
-import { h, render } from "https://unpkg.com/preact?module";
-import htm from "https://unpkg.com/htm?module";
+import { h, render } from "https://esm.sh/preact";
+import htm from "https://esm.sh/htm";
 
 const html = htm.bind(h);
 

tests/test_web/js_fixtures/component-can-have-child.js

@@ -1,5 +1,5 @@
-import { h, render } from "https://unpkg.com/preact?module";
-import htm from "https://unpkg.com/htm?module";
+import { h, render } from "https://esm.sh/preact";
+import htm from "https://esm.sh/htm";
 
 const html = htm.bind(h);
 

tests/test_web/js_fixtures/exports-two-components.js

@@ -1,5 +1,5 @@
-import { h, render } from "https://unpkg.com/preact?module";
-import htm from "https://unpkg.com/htm?module";
+import { h, render } from "https://esm.sh/preact";
+import htm from "https://esm.sh/htm";
 
 const html = htm.bind(h);
 

tests/test_web/js_fixtures/simple-button.js

@@ -1,5 +1,5 @@
-import { h, render } from "https://unpkg.com/preact?module";
-import htm from "https://unpkg.com/htm?module";
+import { h, render } from "https://esm.sh/preact";
+import htm from "https://esm.sh/htm";
 
 const html = htm.bind(h);