Firebase functions can't accept any encoding other than UTF-8 for URLs.

### Related issues

### [REQUIRED] Version info

**node:**
v20.11.0

**firebase-functions:** v4.9.0

**firebase-tools:** 13.25.0

**firebase-admin:** ^12.0.0

### [REQUIRED] Test case

```
import basicAuth from 'basic-auth-connect';
const cookieParser = require('cookie-parser');

const server = express();
server.use(cookieParser(process.env.COOKIE_SECRET));
server.disable('x-powered-by');
server.all(
'/*',
basicAuth(
(user: string, passwd: string) =>
user === 'username' && passwd === 'passwd ',
),
);

// Middleware to catch and validate URL encoding
server.use((req, res, next) => {
try {
decodeURIComponent(req.url); // Try to decode the URL
next(); // Continue if decoding is successful
} catch (err) {
// If decoding fails, return a 400 Bad Request with a custom error message
res.status(400).send({ error: 'Invalid URL encoding' });
}
});

server.use('*', express.static(__dirname + '/static/'));

export const newapp = functions.https.onRequest(
{},
server,
);
```
### [REQUIRED] Steps to reproduce

Link to https cloud functions gen2 ( Cloud run ) :
`https://myapp--an.a.run.app`

Try access url `https://myapp--an.a.run.app/%C3` with param or query that contain encoded characters like Windows-1252 , ISO-8859-1( Example: %C3 ) will return internal server error.

### [REQUIRED] Expected behavior

Function can access url contain other than UTF-8 encoded characters without throw internal server error. ( Or just throw 400 bad request )

### [REQUIRED] Actual behavior

Error: No default engine was specified and no extension was provided.

### Were you able to successfully deploy your functions?

Function is successfully deployed, only occur an error when meet special characters in url.