Close renderer headless browser in finally block.

Prevent zombie browser processes when creating the PDF fails by moving browser.close() to a finally block of the try/catch.

Closes #8979.

components/renderer/src/index.js

@@ -42,12 +42,13 @@ app.get("/api/render", async (req, res) => {
             }
         });
         console.log(`URL ${url}: PDF created`);
-        await browser.close();
         res.contentType("application/pdf");
         res.send(pdf);
     } catch (error) {
         console.error(error)
         res.sendStatus(500)
+    } finally {
+        await browser.close()
     }
 })