fix: use a transaction for package query; remove refresh

Closes #284

Signed-off-by: Kevin Morris <kevr@0cost.org>

aurweb/packages/util.py

@@ -138,6 +138,7 @@ def updated_packages(limit: int = 0,
         # If we already have a cache, deserialize it and return.
         return orjson.loads(packages)
 
+    with db.begin():
         query = db.query(models.Package).join(models.PackageBase).filter(
             models.PackageBase.PackagerUID.isnot(None)
         ).order_by(
@@ -151,7 +152,6 @@ def updated_packages(limit: int = 0,
     for pkg in query:
         # For each Package returned by the query, append a dict
         # containing Package columns we're interested in.
-        db.refresh(pkg)
         packages.append({
             "Name": pkg.Name,
             "Version": pkg.Version,