fix: update User-Agent string to latest Chrome version in webfetch (#8284)

packages/opencode/src/tool/webfetch.ts

@@ -60,7 +60,7 @@ export const WebFetchTool = Tool.define("webfetch", {
       signal: AbortSignal.any([controller.signal, ctx.abort]),
       headers: {
         "User-Agent":
-          "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
+          "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36",
         Accept: acceptHeader,
         "Accept-Language": "en-US,en;q=0.9",
       },