Update JS any PY dependencies, remove workarounds (#30085)

- Update dependencies via `make update-js update-py svg`
- Remove `postcss` workaround -
https://github.com/postcss/postcss/issues/1914
- Remove `happy-dom` workaround -
https://github.com/capricorn86/happy-dom/pull/1365.
- Tested Katex and Asciinema

web_src/js/svg.js

@@ -205,7 +205,7 @@ export const SvgIcon = {
 
     // make the <SvgIcon class="foo" class-name="bar"> classes work together
     const classes = [];
-    for (const cls of svgOuter.classList.values()) {
+    for (const cls of svgOuter.classList) {
       classes.push(cls);
     }
     // TODO: drop the `className/class-name` prop in the future, only use "class" prop