appstream: parallelize branch info requests

src/services/appstream/update_appstream_data.py

+import asyncio
+
 from telegrinder.modules import logger
 
 from altrepo import altrepo
 
+BRANCHES = ["sisyphus", "p11"]
+
 
 async def update_appstream_data():
 
-    for branch in ["sisyphus", "p11"]:
+    results = await asyncio.gather(*(
+        altrepo.api.package.package_info(
+            "appstream-data-desktop", branch=branch, source=True
+        )
+        for branch in BRANCHES
+    ))
 
-        package = (
-            await altrepo.api.package.package_info(
-                "appstream-data-desktop", branch=branch, source=True
-            )
-        ).packages[0]
+    for branch, result in zip(BRANCHES, results):
+        package = result.packages[0]
         current_version = altrepo.appstream.data.get_current_version(branch)
         package_version = f"{package.version}-{package.release}"
         if (