linting: fix use-dict-literal

Use the dict literal `{}` instead of `dict()`, this is a warning in
newer pylints and its consistent with what we do elsewhere.

osbuild/util/ostree.py

@@ -178,7 +178,7 @@ class PasswdLike:
 
     def __init__(self):
         """Initialize an empty PasswdLike object"""
-        self.db = dict()
+        self.db = {}
 
     @classmethod
     def from_file(cls, path: PathLike, allow_missing_file: bool = False):

osbuild/util/rhsm.py

@@ -79,7 +79,7 @@ class Subscriptions:
         parser = configparser.ConfigParser()
         parser.read_file(fp)
 
-        repositories = dict()
+        repositories = {}
         for section in parser.sections():
             current = {
                 "matchurl": cls._process_baseurl(parser.get(section, "baseurl"))