Fixup #2. Missing key value and wrong TypeHint for return type

Also, since we only get the first element, no need to sort the whole
list, just get the first element if the list were sorted.

utils.py

@@ -271,7 +271,7 @@ def fnmatch_any(branch: str, patterns: list[str]) -> bool:
 
 
 # Priority filter based on saved package branches
-def nextBuild(builder: Builder, requests: list[BuildRequest]) -> str:
+def nextBuild(builder: Builder, requests: list[BuildRequest]) -> BuildRequest:
     def build_request_sort_key(request: BuildRequest):
         branch = request.sources[""].branch
         # Booleans are sorted False first.
@@ -283,7 +283,7 @@ def build_request_sort_key(request: BuildRequest):
             request.getSubmitTime(),
         )
 
-    return sorted(requests, build_request_sort_key)[0]
+    return min(requests, key=build_request_sort_key)
 
 
 def canStartBuild(